chore(edu): update bean statuses and write self-play chapter content

Archive self-play beans, update shader/LLM parent beans to completed,
and add self-play chapter content to ml-self-play.md.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans.yml

@@ -0,0 +1,6 @@
+beans:
+    path: .beans
+    prefix: vibed-
+    id_length: 4
+    default_status: todo
+    default_type: task

.beans/vibed-0fcp--add-justfiles-for-all-projects-with-lint-check-bui.md

@@ -0,0 +1,69 @@
+---
+# vibed-0fcp
+title: Add justfiles for all projects with lint, check, build, build-release, and release recipes
+status: todo
+type: task
+priority: normal
+created_at: 2026-03-10T23:29:17Z
+updated_at: 2026-03-10T23:29:17Z
+---
+
+## Background
+
+The root `TODO.md` calls for each project in the mono-repo to have a `justfile` with standard recipe names so that any contributor can run the same commands regardless of project type. `just` is a command runner similar to Make but with cleaner syntax.
+
+## Recipes to add per project
+
+| Recipe | What it runs |
+|---|---|
+| `lint` | Auto-format: `cargo fmt`, `tofu fmt`, `mdbook build` (edu), etc. |
+| `check` | Static checks: `cargo check && cargo clippy`, `tofu validate && tofu plan`, etc. |
+| `build` | Dev build: `cargo build`, `trunk build`, `mdbook build` |
+| `build-release` | Optimised binary or bundle: `cargo build --release`, `trunk build --release` |
+| `release` | Deploy/publish: `tofu apply`, `wrangler deploy` (where applicable) |
+
+Not every project needs every recipe; stub missing ones with an error or a no-op comment.
+
+## Per-project breakdown
+
+### `nbd/justfile`
+- `lint`: `cargo fmt`
+- `check`: `cargo check && cargo clippy && cargo test`
+- `build`: `cargo build`
+- `build-release`: `cargo build --release`
+- `release`: n/a (CLI tool, no deployment)
+
+### `edu/justfile`
+- `lint`: `mdbook build` (build validates the content)
+- `check`: `mdbook build`
+- `build`: `mdbook build`
+- `build-release`: same as `build` (mdbook has no separate release mode)
+- `release`: TBD — CF Pages auto-deploys from main branch once infra is configured (see edu deployment ticket)
+
+### `quotesdb/api/justfile`
+- `lint`: `cargo fmt`
+- `check`: `cargo check && cargo clippy`
+- `build`: `cargo build`
+- `build-release`: `cargo build --release`
+- `release`: `wrangler deploy` (or `tofu apply` from `infra/`)
+
+### `quotesdb/ui/justfile`
+- `lint`: `cargo fmt`
+- `check`: `cargo check && cargo clippy`
+- `build`: `trunk build`
+- `build-release`: `trunk build --release`
+- `release`: CF Pages auto-deploys from main branch once infra is configured
+
+## Files to create
+
+- `nbd/justfile`
+- `edu/justfile`
+- `quotesdb/api/justfile`
+- `quotesdb/ui/justfile`
+
+## Conventions
+
+- Recipe names must be consistent across all projects (`lint`, `check`, `build`, `build-release`, `release`).
+- Commands are run from the directory containing the `justfile`, so paths are relative to the project directory.
+- Add a comment above each recipe explaining what it does.
+- Check whether the `just` package is already in each project's Nix dev shell (`flake.nix`); add it if missing.

.beans/vibed-wqsu--add-contact-footer-to-all-service-front-ends.md

@@ -0,0 +1,67 @@
+---
+# vibed-wqsu
+title: Add contact footer to all service front-ends
+status: todo
+type: task
+priority: low
+created_at: 2026-03-10T23:29:17Z
+updated_at: 2026-03-10T23:29:17Z
+---
+
+## Background
+
+The root `TODO.md` calls for a footer on every service front-end with contact info:
+
+> Contact: `<site>@elijah.run`
+
+Where `<site>` depends on the service.
+
+## Target services and email addresses
+
+| Service | Front-end type | Contact email |
+|---|---|---|
+| `quotesdb` | Yew (Rust/Wasm) | `quotes@elijah.run` |
+| `edu` | mdbook static site | `vibedbooks@elijah.run` |
+| Blog editor | Yew (not yet built) | `editor@elijah.run` |
+
+## Implementation
+
+### quotesdb/ui
+
+Add a `Footer` component to the Yew app:
+
+1. Create `quotesdb/ui/src/components/footer.rs` (or add inline to `app.rs`).
+2. Render a `<footer>` element at the bottom of every page with the text:
+   `Contact: quotes@elijah.run`
+3. Use an `<a href="mailto:quotes@elijah.run">` tag so it is clickable.
+4. Include the footer in the top-level layout so every route shows it.
+
+### edu (mdbook)
+
+mdbook supports injecting HTML before/after the content via the `[output.html]` table in `book.toml`:
+
+```toml
+[output.html]
+additional-js = []
+additional-css = []
+```
+
+Or use the `before-content` / `after-content` HTML templates. More precisely, create `edu/theme/footer.hbs` with the footer markup and register it in `book.toml`.
+
+Alternatively (simpler): add a `theme/` directory with an `index.hbs` that extends the default template and appends the footer. The mdbook docs for custom theming describe this approach.
+
+Simplest option: add `footer.html` fragment via `[output.html] additional-js` hack, or just add a sentence at the bottom of each page — but that is not scalable.
+
+**Recommended approach for mdbook:** Use mdbook's `theme/index.hbs` override (copy the default from the mdbook source) and add the footer HTML before the closing `</body>` tag:
+
+```html
+<footer style="text-align:center;padding:1em;opacity:0.6">
+  Contact: <a href="mailto:vibedbooks@elijah.run">vibedbooks@elijah.run</a>
+</footer>
+```
+
+## Files involved
+
+- `edu/theme/index.hbs` (new — copy from mdbook default, add footer)
+- `edu/book.toml` (may need `[output.html] theme = "theme"` entry)
+- `quotesdb/ui/src/components/footer.rs` (new) or similar

.claude/settings.json

@@ -3,5 +3,13 @@
     "superpowers@claude-plugins-official": true,
     "plugin-dev@claude-plugins-official": true,
     "rust-analyzer-lsp@claude-plugins-official": true
+  },
+  "hooks": {
+    "SessionStart": [
+      { "hooks": [{ "type": "command", "command": "beans prime" }] }
+    ],
+    "PreCompact": [
+      { "hooks": [{ "type": "command", "command": "beans prime" }] }
+    ]
   }
 }

CLAUDE.md

@@ -327,59 +327,16 @@ Covers:
 
 <task-tracking>
 
-## Task Tracking with nbd
+**IMPORTANT**: before you do anything else, run the `beans prime` command and heed its output.
 
-`nbd` is a CLI tool for managing work tickets, designed for agent workflows.
-
-### Initialisation
+This project uses **beans** for issue tracking. `beans prime` outputs the full usage guide for the current project — always follow its instructions for creating, updating, and tracking work.
 
 ```sh
-nbd init
-```
-
-Run once in the project root. Creates `.nbd/tickets/`. Safe to run multiple times.
+# Initialise (run once per project directory)
+beans init
 
-### Core commands
-
-```sh
-# Create a new ticket (use --ftype md for a human-readable body)
-nbd create --title "Add OAuth login" --type feature --priority 7 --ftype md --json
-
-# List all open tickets (sorted by priority)
-nbd list --json
-
-# Read a specific ticket
-nbd read <id> --json
-
-# Update a ticket
-nbd update <id> --status in_progress --json
-nbd update <id> --status done --json
+# Get full usage guide and instructions for this project
+beans prime
 ```
 
-### Finding what to work on
-
-```sh
-# All tickets that are unblocked and ready to start
-nbd ready --json
-
-# The single highest-priority unblocked ticket
-nbd next --json
-```
-
-### Workflow
-
-1. **Before starting** — create a ticket: `nbd create --title "..." --ftype md --json`
-2. **When starting** — mark it in progress: `nbd update <id> --status in_progress --json`
-3. **When done** — mark it complete: `nbd update <id> --status done --json`
-
-### Guidelines
-
-- **Always pass `--json`** to every command for structured, unambiguous output.
-- **Always pass `--ftype md`** when creating tickets — markdown format keeps the body human-readable.
-- Use `jq` to parse and transform JSON output when needed.
-- Priority scale 0–10: use **7–9** for bugs, **5** for normal tasks, **3** for nice-to-haves.
-- `--type` choices: `project`, `feature`, `task`, `bug`.
-- Use `--deps id1,id2` to express blockers — tickets that must be done first.
-- Create tickets *before* starting non-trivial tasks, not after.
-
 </task-tracking>

Cargo.lock

@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 4
-
-[[package]]
-name = "vibed"
-version = "0.1.0"

Cargo.toml

@@ -1,6 +0,0 @@
-[package]
-name = "vibed"
-version = "0.1.0"
-edition = "2024"
-
-[dependencies]

PROJECTS.md

@@ -1,8 +1,5 @@
 # TODO
 
-## Tools
-- [x] `nbd` agent tasks management cli
-
 ## Projects
 - [ ] QuotesDB website
 - [ ] Local-first Grocery List app

TODO.md

@@ -0,0 +1 @@
+# TODO

common/Cargo.lock

@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 4
-
-[[package]]
-name = "common"
-version = "0.1.0"

common/Cargo.toml

@@ -1,8 +0,0 @@
-[package]
-name = "common"
-version = "0.1.0"
-edition = "2021"
-license = "MIT OR Apache-2.0"
-description = "Shared types, utilities, and definitions for Vibesville services"
-
-[dependencies]

common/src/lib.rs

@@ -1,12 +0,0 @@
-//! Shared types, utilities, and definitions for Vibesville services.
-//!
-//! This crate provides common building blocks used across multiple services
-//! in the Vibesville mono-repo. Services depend on it via a path dependency:
-//!
-//! ```toml
-//! [dependencies]
-//! common = { path = "../common" }
-//! ```
-
-#[cfg(test)]
-mod tests;

common/src/tests.rs

@@ -1 +0,0 @@
-//! Unit tests for the common crate.

edu/.beans.yml

@@ -0,0 +1,6 @@
+beans:
+    path: .beans
+    prefix: edu-
+    id_length: 4
+    default_status: todo
+    default_type: task

edu/.beans/archive/edu-0w1v--markov-exercise-simulating-a-random-walk-rust.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov exercise: Simulating a Random Walk (Rust)"
-priority = 7
-status = "archived"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 5 of edu/markov.md: Exercise 2 — Simulating a Random Walk\n\nLearning objectives:\n- Model a countably-finite state space (bounded integers) in Rust\n- Implement reflecting boundary conditions\n- Aggregate results from many trials into a histogram\n\nContent to produce:\n- Setup instructions (reuse or extend Exercise 1 project)\n- Step-by-step hints:\n  1. Define RandomWalk with min, max, prob_right fields\n  2. Implement step with boundary reflection (clamp or reverse)\n  3. Implement histogram by running simulate() many times\n  4. Print histogram as ASCII bar chart\n  5. Observe convergence toward uniform (symmetric walk) or skewed (asymmetric)\n- Full reference solution\n\nTarget: replace the stub in edu/markov.md §5
+---
+# edu-0w1v
+title: 'Markov exercise: Simulating a Random Walk (Rust)'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-13T22:37:25Z
+parent: edu-svom
+---
+
+Write Section 5 of edu/markov.md: Exercise 2 — Simulating a Random Walk\n\nLearning objectives:\n- Model a countably-finite state space (bounded integers) in Rust\n- Implement reflecting boundary conditions\n- Aggregate results from many trials into a histogram\n\nContent to produce:\n- Setup instructions (reuse or extend Exercise 1 project)\n- Step-by-step hints:\n  1. Define RandomWalk with min, max, prob_right fields\n  2. Implement step with boundary reflection (clamp or reverse)\n  3. Implement histogram by running simulate() many times\n  4. Print histogram as ASCII bar chart\n  5. Observe convergence toward uniform (symmetric walk) or skewed (asymmetric)\n- Full reference solution\n\nTarget: replace the stub in edu/markov.md §5

edu/.beans/archive/edu-16fy--6-recognizing-atoms-integers-booleans-strings-symb.md

@@ -1,10 +1,12 @@
-+++
-title = "§6 Recognizing Atoms: Integers, Booleans, Strings, Symbols"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-16fy
+title: '§6 Recognizing Atoms: Integers, Booleans, Strings, Symbols'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
 
 ## §6 Recognizing Atoms: Integers, Booleans, Strings, Symbols — Stub to fill
 

edu/.beans/archive/edu-18qe--markov-lesson-what-is-a-markov-chain.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov lesson: What Is a Markov Chain?"
-priority = 7
-status = "done"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 1 of edu/markov.md: 'What Is a Markov Chain?'\n\nLearning objectives:\n- Define the Markov property (memorylessness)\n- Give 3–4 concrete real-world examples (weather, board games, web surfing, genetics)\n- Explain why the Markov property is a useful modelling assumption\n- Introduce the notation P(Xₙ₊₁ = s | X₀, …, Xₙ) = P(Xₙ₊₁ = s | Xₙ)\n\nContent to produce:\n- 3–5 paragraphs of prose\n- At least one illustrative example worked through informally\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §1
+---
+# edu-18qe
+title: 'Markov lesson: What Is a Markov Chain?'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-13T22:37:25Z
+parent: edu-svom
+---
+
+Write Section 1 of edu/markov.md: 'What Is a Markov Chain?'\n\nLearning objectives:\n- Define the Markov property (memorylessness)\n- Give 3–4 concrete real-world examples (weather, board games, web surfing, genetics)\n- Explain why the Markov property is a useful modelling assumption\n- Introduce the notation P(Xₙ₊₁ = s | X₀, …, Xₙ) = P(Xₙ₊₁ = s | Xₙ)\n\nContent to produce:\n- 3–5 paragraphs of prose\n- At least one illustrative example worked through informally\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §1

edu/.beans/archive/edu-1oh8--12-exercise-5-retrieval-augmented-generation.md

@@ -1,10 +1,13 @@
-+++
-title = "§12 Exercise 5: Retrieval-Augmented Generation"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-1oh8
+title: '§12 Exercise 5: Retrieval-Augmented Generation'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
+
 ## §12 Exercise 5 — Retrieval-Augmented Generation — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 12. Exercise 5 — Retrieval-Augmented Generation`
@@ -87,4 +90,4 @@ Print the retrieved passages first (so the reader can see what context was used)
 
 ## Reference solution
 
-Full `main.rs` inside `<details>`. Keep `retrieve`, `build_prompt`, and `call_llm` as clearly named separate functions. The `main` function should be a thin orchestrator.
+Full `main.rs` inside `<details>`. Keep `retrieve`, `build_prompt`, and `call_llm` as clearly named separate functions. The `main` function should be a thin orchestrator.

edu/.beans/archive/edu-34co--markov-lesson-applications-and-further-reading.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov lesson: Applications and Further Reading"
-priority = 7
-status = "done"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 10 of edu/markov.md: 'Applications and Further Reading'\n\nLearning objectives:\n- Survey real-world applications: PageRank, MCMC, HMMs, RL, bioinformatics\n- Give a 2–3 sentence description of each application and how Markov chains appear\n- Point to concrete next steps for learners who want to go deeper\n\nContent to produce:\n- Application survey (5–7 topics, each 2–3 sentences)\n- Annotated reading list:\n  * 'Introduction to Probability' (Blitzstein & Hwang) — free PDF\n  * 'Markov Chains' (Norris) — rigorous treatment\n  * Sutton & Barto 'Reinforcement Learning' — RL connection\n  * The Metropolis-Hastings algorithm article on Wikipedia\n- Rust ecosystem pointers (crates for probabilistic modelling)\n\nTarget: replace the stub in edu/markov.md §10
+---
+# edu-34co
+title: 'Markov lesson: Applications and Further Reading'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-13T22:37:26Z
+parent: edu-svom
+---
+
+Write Section 10 of edu/markov.md: 'Applications and Further Reading'\n\nLearning objectives:\n- Survey real-world applications: PageRank, MCMC, HMMs, RL, bioinformatics\n- Give a 2–3 sentence description of each application and how Markov chains appear\n- Point to concrete next steps for learners who want to go deeper\n\nContent to produce:\n- Application survey (5–7 topics, each 2–3 sentences)\n- Annotated reading list:\n  * 'Introduction to Probability' (Blitzstein & Hwang) — free PDF\n  * 'Markov Chains' (Norris) — rigorous treatment\n  * Sutton & Barto 'Reinforcement Learning' — RL connection\n  * The Metropolis-Hastings algorithm article on Wikipedia\n- Rust ecosystem pointers (crates for probabilistic modelling)\n\nTarget: replace the stub in edu/markov.md §10

edu/.beans/archive/edu-3sww--11-checking-special-forms.md

@@ -1,10 +1,12 @@
-+++
-title = "§11 Checking Special Forms"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-3sww
+title: §11 Checking Special Forms
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
 
 ## §11 Checking Special Forms — Stub to fill
 

edu/.beans/archive/edu-3yw9--write-2-monte-carlo-tree-search-algorithm-explaine.md

@@ -0,0 +1,14 @@
+---
+# edu-3yw9
+title: 'Write §2: Monte Carlo Tree Search — algorithm explained'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T22:48:46Z
+parent: edu-coqp
+---
+
+Step-by-step walkthrough of MCTS: selection (UCB1), expansion, simulation/rollout, backpropagation. Include a worked example on a small game tree.
+
+## Summary of Changes\n\nWrote full content for §2 covering MCTS algorithm: the four phases (selection, expansion, simulation, backpropagation), UCB1/UCT formula, worked ASCII tree example, and strengths/limitations.

edu/.beans/archive/edu-453h--write-13-the-full-alphago-zero-training-loop.md

@@ -0,0 +1,14 @@
+---
+# edu-453h
+title: 'Write §13: The full AlphaGo Zero training loop'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-16T01:35:06Z
+parent: edu-coqp
+---
+
+Reading lesson: generate → train → evaluate → promote. Discuss the ELO-based model selection step and why it matters.
+
+## Summary of Changes\n\nWrote full content for §13 covering the complete AlphaGo Zero training loop: self-play with temperature, training, evaluation gate, and the iterative improvement cycle with complete Rust implementation.

edu/.beans/archive/edu-4gok--markov-exercise-n-gram-generalization-rust.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov exercise: N-gram Generalization (Rust)"
-priority = 7
-status = "done"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 8 of edu/markov.md: Exercise 4 — N-gram Generalization\n\nLearning objectives:\n- Generalize from bigrams to arbitrary-order n-gram chains\n- Use Vec<String> as a HashMap key (or a joined string)\n- Empirically compare output quality for n = 1, 2, 3, 4\n\nContent to produce:\n- Setup instructions (extend Exercise 3 project)\n- Step-by-step hints:\n  1. Modify train to use a sliding window of n words as the key\n  2. Modify generate to maintain a deque/window of the last n words\n  3. Run on the same corpus with n = 1, 2, 3, 4 and print 50 words each\n  4. Discuss observations: when does it start memorising the corpus?\n- Full reference solution\n- Stretch goal: implement character-level n-grams instead of word-level\n\nTarget: replace the stub in edu/markov.md §8
+---
+# edu-4gok
+title: 'Markov exercise: N-gram Generalization (Rust)'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-13T22:37:26Z
+parent: edu-svom
+---
+
+Write Section 8 of edu/markov.md: Exercise 4 — N-gram Generalization\n\nLearning objectives:\n- Generalize from bigrams to arbitrary-order n-gram chains\n- Use Vec<String> as a HashMap key (or a joined string)\n- Empirically compare output quality for n = 1, 2, 3, 4\n\nContent to produce:\n- Setup instructions (extend Exercise 3 project)\n- Step-by-step hints:\n  1. Modify train to use a sliding window of n words as the key\n  2. Modify generate to maintain a deque/window of the last n words\n  3. Run on the same corpus with n = 1, 2, 3, 4 and print 50 words each\n  4. Discuss observations: when does it start memorising the corpus?\n- Full reference solution\n- Stretch goal: implement character-level n-grams instead of word-level\n\nTarget: replace the stub in edu/markov.md §8

edu/.beans/archive/edu-4kkb--12-the-c-runtime-preamble.md

@@ -1,10 +1,12 @@
-+++
-title = "§12 The C Runtime Preamble"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-4kkb
+title: §12 The C Runtime Preamble
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
 
 ## §12 The C Runtime Preamble — Stub to fill
 

edu/.beans/archive/edu-4v13--write-8-exercise-2-play-tic-tac-toe-with-pure-mcts.md

@@ -0,0 +1,16 @@
+---
+# edu-4v13
+title: 'Write §8: Exercise 2 — play Tic-Tac-Toe with pure MCTS'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T23:04:14Z
+parent: edu-coqp
+---
+
+Exercise: wire MCTS to the game logic from Exercise 1 and run a match. Show sample output, discuss iteration count vs strength.
+
+## Summary of Changes
+
+Wrote full content for §8: Exercise 2 with MCTS vs MCTS tournament (100 games, iteration count experiments), human vs MCTS CLI game, experimentation prompts, and readiness checklist.

edu/.beans/archive/edu-5go8--write-3-why-self-play-the-alphago-zero-insight.md

@@ -0,0 +1,14 @@
+---
+# edu-5go8
+title: 'Write §3: Why self-play? The AlphaGo Zero insight'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T22:51:31Z
+parent: edu-coqp
+---
+
+Explain the key insight: a capable engine can be its own teacher. Historical context (AlphaGo vs AlphaGo Zero) and why the approach generalises.
+
+## Summary of Changes\n\nWrote full content for §3 covering the evolution from Deep Blue to AlphaGo Zero, the self-play insight, the virtuous training cycle, and how we'll adapt the approach for Tic-Tac-Toe.

edu/.beans/archive/edu-63ze--13-generating-c-atoms-and-expressions.md

@@ -1,10 +1,12 @@
-+++
-title = "§13 Generating C: Atoms and Expressions"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-63ze
+title: '§13 Generating C: Atoms and Expressions'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
 
 ## §13 Generating C: Atoms and Expressions — Stub to fill
 

edu/.beans/archive/edu-6r70--markov-exercise-bigram-text-generator-rust.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov exercise: Bigram Text Generator (Rust)"
-priority = 7
-status = "done"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 7 of edu/markov.md: Exercise 3 — Bigram Text Generator\n\nLearning objectives:\n- Build a HashMap-based transition table from a text corpus\n- Implement weighted random sampling over successor words\n- Generate and print novel word sequences from a seed\n\nContent to produce:\n- Setup instructions (new Cargo project or extend previous, add rand crate)\n- Step-by-step hints:\n  1. Tokenize corpus into words (split_whitespace)\n  2. Build BigramModel::train by iterating consecutive word pairs\n  3. Implement weighted sampling in generate (accumulate weights, compare to rng draw)\n  4. Handle end-of-chain gracefully (seed word not in model)\n  5. Try with a public-domain text (e.g., Project Gutenberg excerpt)\n- Full reference solution\n\nTarget: replace the stub in edu/markov.md §7
+---
+# edu-6r70
+title: 'Markov exercise: Bigram Text Generator (Rust)'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-13T22:37:26Z
+parent: edu-svom
+---
+
+Write Section 7 of edu/markov.md: Exercise 3 — Bigram Text Generator\n\nLearning objectives:\n- Build a HashMap-based transition table from a text corpus\n- Implement weighted random sampling over successor words\n- Generate and print novel word sequences from a seed\n\nContent to produce:\n- Setup instructions (new Cargo project or extend previous, add rand crate)\n- Step-by-step hints:\n  1. Tokenize corpus into words (split_whitespace)\n  2. Build BigramModel::train by iterating consecutive word pairs\n  3. Implement weighted sampling in generate (accumulate weights, compare to rng draw)\n  4. Handle end-of-chain gracefully (seed word not in model)\n  5. Try with a public-domain text (e.g., Project Gutenberg excerpt)\n- Full reference solution\n\nTarget: replace the stub in edu/markov.md §7

edu/.beans/archive/edu-7cp2--markov-exercise-weather-model-rust.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov exercise: Weather Model (Rust)"
-priority = 7
-status = "archived"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 4 of edu/markov.md: Exercise 1 — Weather Model\n\nLearning objectives:\n- Translate a transition matrix into a Rust struct\n- Use a weighted random draw to implement a single Markov step\n- Run a simulation and print or collect the resulting sequence\n\nContent to produce:\n- Setup instructions (new Cargo project, add rand crate)\n- Step-by-step hints:\n  1. Define the Weather enum and index conversion\n  2. Implement WeatherChain::step using rand::Rng::gen::<f64>()\n  3. Implement WeatherChain::simulate as a loop collecting states\n  4. Run with transition matrix [[0.8, 0.2], [0.4, 0.6]] from Sunny\n  5. Count sunny vs rainy days and compare to stationary distribution\n- Full reference solution (collapsed or at end)\n\nTarget: replace the stub in edu/markov.md §4
+---
+# edu-7cp2
+title: 'Markov exercise: Weather Model (Rust)'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-13T22:37:25Z
+parent: edu-svom
+---
+
+Write Section 4 of edu/markov.md: Exercise 1 — Weather Model\n\nLearning objectives:\n- Translate a transition matrix into a Rust struct\n- Use a weighted random draw to implement a single Markov step\n- Run a simulation and print or collect the resulting sequence\n\nContent to produce:\n- Setup instructions (new Cargo project, add rand crate)\n- Step-by-step hints:\n  1. Define the Weather enum and index conversion\n  2. Implement WeatherChain::step using rand::Rng::gen::<f64>()\n  3. Implement WeatherChain::simulate as a loop collecting states\n  4. Run with transition matrix [[0.8, 0.2], [0.4, 0.6]] from Sunny\n  5. Count sunny vs rainy days and compare to stationary distribution\n- Full reference solution (collapsed or at end)\n\nTarget: replace the stub in edu/markov.md §4

edu/.beans/archive/edu-7lu6--write-12-exercise-4-replace-rollout-with-the-value.md

@@ -0,0 +1,16 @@
+---
+# edu-7lu6
+title: 'Write §12: Exercise 4 — replace rollout with the value network'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-16T01:31:54Z
+parent: edu-coqp
+---
+
+Exercise: substitute random rollout in MCTS with a neural-network value estimate; compare strength before and after.
+
+## Summary of Changes
+
+Wrote full content for §12: Exercise 4 covering PUCT formula, replacing random rollouts with value network evaluation, adding policy priors to MCTS nodes, modified MCTS code, and pure vs network-guided MCTS comparison.

edu/.beans/archive/edu-91j2--vector-db.md

@@ -1,10 +1,26 @@
-+++
-title = "vector-db"
-priority = 5
-status = "todo"
-ticket_type = "project"
-dependencies = ["21d9be", "584e0c", "99e1d9", "d9f850", "6ec5ff", "37cdd5", "081a55", "5674ce", "4c961f", "1ef9f4", "e8be9a", "5ed295"]
-+++
+---
+# edu-91j2
+title: vector-db
+status: completed
+type: epic
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:04Z
+blocked_by:
+    - edu-mlut
+    - edu-hvic
+    - edu-twtl
+    - edu-hvmi
+    - edu-uz3e
+    - edu-ic66
+    - edu-pdeo
+    - edu-paqf
+    - edu-c98s
+    - edu-ga52
+    - edu-dgfl
+    - edu-1oh8
+---
+
 ## Project: Vector Database Self-Guided Course
 
 This is the top-level project ticket for `edu/src/vector-db.md` — a self-guided mdbook course on vector databases in the **Vibed Learning** site (`edu/`).
@@ -47,4 +63,4 @@ The course is modelled on `edu/src/markov.md`. It teaches vector databases throu
 - **KNN query:** `vector_top_k('table', vector('[...]'), k)` table-valued function
 - **Distance function:** `vector_distance_cos(a, b)` — 0 = identical, 2 = opposite
 
-This project ticket closes when all 12 section tickets are done and `mdbook build` passes.
+This project ticket closes when all 12 section tickets are done and `mdbook build` passes.

edu/.beans/archive/edu-9kuk--markov-lesson-text-generation-with-markov-chains.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov lesson: Text Generation with Markov Chains"
-priority = 7
-status = "done"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 6 of edu/markov.md: 'Text Generation with Markov Chains'\n\nLearning objectives:\n- Explain how words (or characters) become states in a text Markov chain\n- Define bigrams and how they form a transition table from a corpus\n- Discuss why generated text sounds locally plausible but globally incoherent\n- Introduce the concept of order-n chains and the tradeoff between coherence and novelty\n\nContent to produce:\n- 3–5 paragraphs of prose\n- A short worked bigram example from a 2-sentence sample text (show the table)\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §6
+---
+# edu-9kuk
+title: 'Markov lesson: Text Generation with Markov Chains'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-13T22:37:26Z
+parent: edu-svom
+---
+
+Write Section 6 of edu/markov.md: 'Text Generation with Markov Chains'\n\nLearning objectives:\n- Explain how words (or characters) become states in a text Markov chain\n- Define bigrams and how they form a transition table from a corpus\n- Discuss why generated text sounds locally plausible but globally incoherent\n- Introduce the concept of order-n chains and the tradeoff between coherence and novelty\n\nContent to produce:\n- 3–5 paragraphs of prose\n- A short worked bigram example from a 2-sentence sample text (show the table)\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §6

edu/.beans/archive/edu-a1al--markov-lesson-transition-probabilities-and-matrice.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov lesson: Transition Probabilities and Matrices"
-priority = 7
-status = "done"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 3 of edu/markov.md: 'Transition Probabilities and Matrices'\n\nLearning objectives:\n- Formally define the transition matrix P where P[i][j] = P(next=j | current=i)\n- Explain the stochastic matrix constraint: all rows sum to 1, all entries ≥ 0\n- Show how to compute the distribution after k steps: π₀ Pᵏ\n- Work through a 2×2 weather-model example by hand\n\nContent to produce:\n- 3–5 paragraphs of prose\n- A worked numeric example (2-state weather chain)\n- LaTeX-style or plain-text matrix notation\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §3
+---
+# edu-a1al
+title: 'Markov lesson: Transition Probabilities and Matrices'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-13T22:37:25Z
+parent: edu-svom
+---
+
+Write Section 3 of edu/markov.md: 'Transition Probabilities and Matrices'\n\nLearning objectives:\n- Formally define the transition matrix P where P[i][j] = P(next=j | current=i)\n- Explain the stochastic matrix constraint: all rows sum to 1, all entries ≥ 0\n- Show how to compute the distribution after k steps: π₀ Pᵏ\n- Work through a 2×2 weather-model example by hand\n\nContent to produce:\n- 3–5 paragraphs of prose\n- A worked numeric example (2-state weather chain)\n- LaTeX-style or plain-text matrix notation\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §3

edu/.beans/archive/edu-azf5--2-minilisp-language-specification.md

@@ -1,10 +1,12 @@
-+++
-title = "§2 MiniLisp Language Specification"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-azf5
+title: §2 MiniLisp Language Specification
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
 
 ## §2 MiniLisp Language Specification — Stub to fill
 

edu/.beans/archive/edu-b73b--course-writing-a-lisp-to-c-compiler-in-rust.md

@@ -1,10 +1,31 @@
-+++
-title = "Course: Writing a Lisp-to-C Compiler in Rust"
-priority = 5
-status = "todo"
-ticket_type = "project"
-dependencies = ["e8da8b", "a93829", "3aeb62", "5835e9", "3dc36b", "685f5e", "a1a827", "b6c9ad", "a4c9f8", "d0b9f8", "6d40a7", "3e1250", "1eb794", "cbc6e3", "de82f1", "58b37a", "8fa47a", "1d16da"]
-+++
+---
+# edu-b73b
+title: 'Course: Writing a Lisp-to-C Compiler in Rust'
+status: completed
+type: epic
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:03Z
+blocked_by:
+    - edu-ylb8
+    - edu-azf5
+    - edu-n9ap
+    - edu-jzvr
+    - edu-g1r5
+    - edu-16fy
+    - edu-n7zb
+    - edu-mmbr
+    - edu-tzzh
+    - edu-h3yx
+    - edu-3sww
+    - edu-4kkb
+    - edu-63ze
+    - edu-pyue
+    - edu-unus
+    - edu-nc61
+    - edu-v0ud
+    - edu-y4e6
+---
 
 ## Course: Writing a Lisp-to-C Compiler in Rust
 

edu/.beans/archive/edu-brtk--write-14-exercise-5-1000-self-play-games-observe-i.md

@@ -0,0 +1,14 @@
+---
+# edu-brtk
+title: 'Write §14: Exercise 5 — 1000 self-play games; observe improvement'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-16T01:40:32Z
+parent: edu-coqp
+---
+
+Capstone exercise: run the full self-play loop for 1000 games; plot win-rate over iterations; discuss what worked and what didn't.
+
+## Summary of Changes\n\nWrote full content for §14: Exercise 5 — the capstone exercise running 1000 self-play games, tracking diagnostics, validating convergence to perfect play, and providing next steps for further learning.

edu/.beans/archive/edu-c98s--9-generating-embeddings-in-rust.md

@@ -1,10 +1,13 @@
-+++
-title = "§9 Generating Embeddings in Rust"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-c98s
+title: §9 Generating Embeddings in Rust
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
+
 ## §9 Generating Embeddings in Rust — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 9. Generating Embeddings in Rust`
@@ -60,4 +63,4 @@ Show a minimal async function that POSTs to the embeddings endpoint and returns
 
 **Choosing between them.** Recommend fastembed for §10–§12 because: no API key, no network dependency, deterministic results (important for exercises), sub-100ms per batch on CPU. Use the HTTP approach when you need a specific production-grade model or have one already deployed.
 
-**Dimensionality note.** The `F32_BLOB(d)` column type must match the model's output dimension exactly — you cannot mix dimensions. Change the DDL from the toy `F32_BLOB(3)` used in §6–§8 to `F32_BLOB(384)` for BGE-Small, `F32_BLOB(768)` for all-MiniLM-L6-v2, or `F32_BLOB(1536)` for OpenAI text-embedding-3-small. The index must also be dropped and recreated if you change the dimension.
+**Dimensionality note.** The `F32_BLOB(d)` column type must match the model's output dimension exactly — you cannot mix dimensions. Change the DDL from the toy `F32_BLOB(3)` used in §6–§8 to `F32_BLOB(384)` for BGE-Small, `F32_BLOB(768)` for all-MiniLM-L6-v2, or `F32_BLOB(1536)` for OpenAI text-embedding-3-small. The index must also be dropped and recreated if you change the dimension.

edu/.beans/archive/edu-coqp--edu-write-machine-learning-chapter-self-play-game.md

@@ -0,0 +1,48 @@
+---
+# edu-coqp
+title: 'edu: write Machine Learning chapter (self-play game AI, Alpha Go Zero style)'
+status: completed
+type: feature
+priority: low
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-16T01:40:56Z
+---
+
+## Background
+
+From `edu/TODO.md`: Hands-on: Machine Learning; training a computer to play a game by playing against itself (a-la Alpha Go Zero).
+
+A self-play reinforcement learning course. The practical focus is implementing a simplified version of the MCTS + neural network self-play loop in Rust, targeting a simple deterministic two-player game (e.g., Tic-Tac-Toe or Connect Four).
+
+## Content outline (suggested)
+
+### Part 1 — Foundations
+1. What is reinforcement learning? (state, action, reward, policy, value)
+2. Monte Carlo Tree Search (MCTS) — algorithm explained step by step
+3. Why self-play? The AlphaGo Zero insight
+
+### Part 2 — The Game
+4. Choosing a simple game: Tic-Tac-Toe as the learning vehicle
+5. Representing game state in Rust
+6. Exercise 1: Implement the game logic (move generation, win detection, terminal states)
+
+### Part 3 — MCTS
+7. Implementing MCTS in Rust (selection, expansion, simulation, backpropagation)
+8. Exercise 2: Play Tic-Tac-Toe with pure MCTS (no neural network)
+
+### Part 4 — Neural Network Policy/Value Head
+9. Overview of the network architecture (shared trunk + policy head + value head)
+10. Integrating a neural network crate (e.g., `tch-rs` or `candle`)
+11. Exercise 3: Train the network on MCTS-generated data
+12. Exercise 4: Replace MCTS simulation with the learned value function
+
+### Part 5 — Self-Play Loop
+13. The full Alpha Go Zero training loop: generate data → train → evaluate → repeat
+14. Exercise 5: Run 1000 self-play games and observe the policy improving
+
+## File to create
+
+- `edu/src/ml-self-play.md`
+- Add to `edu/src/SUMMARY.md` under a `# Machine Learning` section
+
+## Summary of Changes\n\nAll 14 sections written (7,622 lines total). The chapter covers:\n- Part 1 (§1-3): RL fundamentals, MCTS algorithm, AlphaGo Zero insight\n- Part 2 (§4-6): Tic-Tac-Toe as learning vehicle, Rust game state, Exercise 1\n- Part 3 (§7-8): MCTS implementation in Rust, Exercise 2 (pure MCTS play)\n- Part 4 (§9-12): NN from scratch, training on MCTS data, PUCT-guided MCTS\n- Part 5 (§13-14): Full self-play training loop, capstone exercise

edu/.beans/archive/edu-dgfl--11-exercise-4-recommendation-engine.md

@@ -1,10 +1,13 @@
-+++
-title = "§11 Exercise 4: Recommendation Engine"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-dgfl
+title: '§11 Exercise 4: Recommendation Engine'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
+
 ## §11 Exercise 4 — Recommendation Engine — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 11. Exercise 4 — Recommendation Engine`
@@ -68,4 +71,4 @@ Output format: `"Customers who liked Laptop also liked: Mechanical Keyboard (0.0
 
 ## Reference solution
 
-Full `main.rs` inside `<details>`. The `recommend` function should be clearly separated from the setup boilerplate. The recommendation query pattern (SELECT embedding → feed as query to vector_top_k) is the key technique to highlight.
+Full `main.rs` inside `<details>`. The `recommend` function should be clearly separated from the setup boilerplate. The recommendation query pattern (SELECT embedding → feed as query to vector_top_k) is the key technique to highlight.

edu/.beans/archive/edu-e39n--write-5-representing-game-state-in-rust.md

@@ -0,0 +1,16 @@
+---
+# edu-e39n
+title: 'Write §5: Representing game state in Rust'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T22:56:30Z
+parent: edu-coqp
+---
+
+Reading lesson: design of Board, Player, Move types. Discuss representation trade-offs (bitboard vs array). Show the full type definitions.
+
+## Summary of Changes
+
+Wrote full content for §5 covering Rust game state representation: Player enum, GameState struct, board indexing, Display impl, move generation, winner checking, and immutable apply_move design.

edu/.beans/archive/edu-g1r5--5-setting-up-the-project.md

@@ -1,10 +1,12 @@
-+++
-title = "§5 Setting Up the Project"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-g1r5
+title: §5 Setting Up the Project
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
 
 ## §5 Setting Up the Project — Stub to fill
 

edu/.beans/archive/edu-ga52--10-exercise-3-semantic-document-search.md

@@ -1,10 +1,13 @@
-+++
-title = "§10 Exercise 3: Semantic Document Search"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-ga52
+title: '§10 Exercise 3: Semantic Document Search'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
+
 ## §10 Exercise 3 — Semantic Document Search — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 10. Exercise 3 — Semantic Document Search`
@@ -77,4 +80,4 @@ Print results ranked by distance with the passage text.
 
 ## Reference solution
 
-Full self-contained `main.rs` inside `<details>`: creates table, embeds and inserts all 15 passages, runs three queries, prints results.
+Full self-contained `main.rs` inside `<details>`: creates table, embeds and inserts all 15 passages, runs three queries, prints results.

edu/.beans/archive/edu-h3yx--10-symbol-tables-and-scope.md

@@ -1,10 +1,12 @@
-+++
-title = "§10 Symbol Tables and Scope"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-h3yx
+title: §10 Symbol Tables and Scope
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
 
 ## §10 Symbol Tables and Scope — Stub to fill
 

edu/.beans/archive/edu-hvic--2-embeddings.md

@@ -1,10 +1,13 @@
-+++
-title = "§2 Embeddings"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-hvic
+title: §2 Embeddings
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
+
 ## §2 Embeddings — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 2. Embeddings`
@@ -34,4 +37,4 @@ This is a **reading lesson** — no Rust code. Target 400–700 words. Follow th
 
 **Practical dimensionalities.** 384 (MiniLM, fast, ~130MB), 768 (BERT-base, sentence-transformers default), 1536 (OpenAI text-embedding-3-small), 3072 (text-embedding-3-large). Larger is not always better — depends on task and dataset.
 
-**Embeddings for non-text data.** Brief mention: CLIP produces image embeddings comparable to text embeddings in the same space (enabling text-to-image search). Product embeddings can be learned from purchase co-occurrence. The vector database stores float arrays regardless of modality.
+**Embeddings for non-text data.** Brief mention: CLIP produces image embeddings comparable to text embeddings in the same space (enabling text-to-image search). Product embeddings can be learned from purchase co-occurrence. The vector database stores float arrays regardless of modality.

edu/.beans/archive/edu-hvmi--4-what-is-a-vector-database.md

@@ -1,10 +1,13 @@
-+++
-title = "§4 What Is a Vector Database?"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-hvmi
+title: §4 What Is a Vector Database?
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
+
 ## §4 What Is a Vector Database? — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 4. What Is a Vector Database?`
@@ -43,4 +46,4 @@ This is a **reading lesson** — no Rust code. Target 500–700 words. Bold lead
 - Index build time: one-time cost paid before serving queries.
 - Memory footprint: HNSW stores graph edges in RAM; this limits how large the index can grow on a single machine.
 
-**Where sqlite-vec / Turso fits.** sqlite-vec is appropriate for embedded applications, local development, and small-to-medium corpora (up to a few million vectors). Dedicated cloud vector databases (Pinecone, Qdrant, Weaviate) handle larger scale and add features like multi-tenancy, filtering, and distributed search.
+**Where sqlite-vec / Turso fits.** sqlite-vec is appropriate for embedded applications, local development, and small-to-medium corpora (up to a few million vectors). Dedicated cloud vector databases (Pinecone, Qdrant, Weaviate) handle larger scale and add features like multi-tenancy, filtering, and distributed search.

edu/.beans/archive/edu-ic66--6-setting-up-turso-sqlite-vec.md

@@ -1,10 +1,13 @@
-+++
-title = "§6 Setting Up Turso + sqlite-vec"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-ic66
+title: §6 Setting Up Turso + sqlite-vec
+status: scrapped
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
+
 ## §6 Setting Up Turso + sqlite-vec — ALREADY COMPLETE
 
 This section is fully written in `edu/src/vector-db.md` under `### 6. Setting Up`. No further content work is needed. Mark this ticket done.
@@ -18,4 +21,4 @@ This section is fully written in `edu/src/vector-db.md` under `### 6. Setting Up
 - Reference table of all sqlite-vec constructs used in later exercises: `F32_BLOB(d)`, `vector()`, `vector_extract()`, `vector_distance_cos()`, `libsql_vector_idx`, `vector_top_k()`
 - Creating a `F32_BLOB(3)` vector table
 - Creating an HNSW index with `USING libsql_vector_idx(embedding)`
-- Complete working `main.rs` listing — produces "SQLite version: x.y.z" and "Database ready."
+- Complete working `main.rs` listing — produces "SQLite version: x.y.z" and "Database ready."

edu/.beans/archive/edu-iv0k--write-9-neural-network-architecture-overview.md

@@ -0,0 +1,16 @@
+---
+# edu-iv0k
+title: 'Write §9: Neural network architecture overview'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T23:07:35Z
+parent: edu-coqp
+---
+
+Conceptual lesson: shared convolutional trunk, policy head (move probabilities), value head (win probability). Diagrams encouraged. No code yet.
+
+## Summary of Changes
+
+Wrote full content for §9 covering neural network fundamentals from scratch: neurons/weights/biases, layers, forward pass, training intuition, and the dual-headed policy+value architecture for game AI with concrete TTT dimensions.

edu/.beans/archive/edu-jzvr--4-introduction-to-nom-parser-combinators.md

@@ -1,10 +1,12 @@
-+++
-title = "§4 Introduction to nom: Parser Combinators"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-jzvr
+title: '§4 Introduction to nom: Parser Combinators'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
 
 ## §4 Introduction to nom: Parser Combinators — Stub to fill
 

edu/.beans/archive/edu-k3tq--write-4-choosing-a-simple-game-tic-tac-toe.md

@@ -0,0 +1,16 @@
+---
+# edu-k3tq
+title: 'Write §4: Choosing a simple game — Tic-Tac-Toe'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T22:53:54Z
+parent: edu-coqp
+---
+
+Explain why Tic-Tac-Toe is ideal: small state space, deterministic, zero-sum, easily verifiable. Foreshadow how the same approach scales to Go/Chess.
+
+## Summary of Changes
+
+Wrote full content for §4 covering why Tic-Tac-Toe is the ideal learning vehicle: suitable game properties, game tree size, known optimal solution as validation target, and comparison with alternatives.

edu/.beans/archive/edu-lqky--write-11-exercise-3-train-the-network-on-mcts-data.md

@@ -0,0 +1,14 @@
+---
+# edu-lqky
+title: 'Write §11: Exercise 3 — train the network on MCTS data'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-16T00:32:55Z
+parent: edu-coqp
+---
+
+Exercise: generate training examples (state, policy vector, value) from pure MCTS self-play; run one training epoch; log loss.
+
+## Summary of Changes\n\nWrote full content for §11: Exercise 3 covering MCTS data generation pipeline, TrainingExample struct, mini-batch SGD training loop, loss tracking, network evaluation, and experimentation prompts.

edu/.beans/archive/edu-mlut--1-what-is-a-vector.md

@@ -1,10 +1,13 @@
-+++
-title = "§1 What Is a Vector?"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-mlut
+title: §1 What Is a Vector?
+status: scrapped
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
+
 ## §1 What Is a Vector? — ALREADY COMPLETE
 
 This section is fully written in `edu/src/vector-db.md` under `### 1. What Is a Vector?`. No further content work is needed. Mark this ticket done.
@@ -15,4 +18,4 @@ This section is fully written in `edu/src/vector-db.md` under `### 1. What Is a
 - Geometric intuition in 2D and 3D: magnitude (`‖v‖ = √(Σ vᵢ²)`), direction, orthogonality via dot product
 - High-dimensional spaces: the curse of dimensionality, normalisation onto the unit hypersphere, dimensions are not individually interpretable features
 - Vectors as representations: the key insight that similarity in meaning corresponds to proximity in vector space — the basis of everything that follows
-- Notation used throughout the course: **v**, `v[i]`, `‖v‖`, *d* for dimension, *n* for number of stored vectors
+- Notation used throughout the course: **v**, `v[i]`, `‖v‖`, *d* for dimension, *n* for number of stored vectors

edu/.beans/archive/edu-mmbr--8-parsing-atoms-with-nom.md

@@ -1,10 +1,12 @@
-+++
-title = "§8 Parsing Atoms with nom"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-mmbr
+title: §8 Parsing Atoms with nom
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
 
 ## §8 Parsing Atoms with nom — Stub to fill
 

edu/.beans/archive/edu-n7zb--7-the-abstract-syntax-tree.md

@@ -1,10 +1,12 @@
-+++
-title = "§7 The Abstract Syntax Tree"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-n7zb
+title: §7 The Abstract Syntax Tree
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
 
 ## §7 The Abstract Syntax Tree — Stub to fill
 

edu/.beans/archive/edu-n9ap--3-compiler-architecture-the-pipeline.md

@@ -1,10 +1,12 @@
-+++
-title = "§3 Compiler Architecture: The Pipeline"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-n9ap
+title: '§3 Compiler Architecture: The Pipeline'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
 
 ## §3 Compiler Architecture: The Pipeline — Stub to fill
 

edu/.beans/archive/edu-nc61--16-the-compilation-pipeline.md

@@ -1,10 +1,12 @@
-+++
-title = "§16 The Compilation Pipeline"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-nc61
+title: §16 The Compilation Pipeline
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
 
 ## §16 The Compilation Pipeline — Stub to fill
 

edu/.beans/archive/edu-of9y--write-7-implementing-mcts-in-rust.md

@@ -0,0 +1,14 @@
+---
+# edu-of9y
+title: 'Write §7: Implementing MCTS in Rust'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T23:01:59Z
+parent: edu-coqp
+---
+
+Walk through selection (UCB1 formula), expansion, simulation (random rollout), backpropagation. Show Rust code for the node structure and the four phases.
+
+## Summary of Changes\n\nWrote full content for §7 covering MCTS implementation in Rust: arena-allocated node structure, all four phases implemented and explained, UCT calculation, main loop, and move selection.

edu/.beans/archive/edu-paqf--8-exercise-2-k-nearest-neighbor-search.md

@@ -1,10 +1,13 @@
-+++
-title = "§8 Exercise 2: K-Nearest Neighbor Search"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-paqf
+title: '§8 Exercise 2: K-Nearest Neighbor Search'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
+
 ## §8 Exercise 2 — K-Nearest Neighbor Search — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 8. Exercise 2 — K-Nearest Neighbor Search`
@@ -62,4 +65,4 @@ Query: [0.85, 0.15, 0.25]
 
 ## Reference solution
 
-Full `main.rs` inside `<details><summary>Show full solution</summary>`. The solution should re-run setup from §7 (create table, insert data) then run the three KNN queries.
+Full `main.rs` inside `<details><summary>Show full solution</summary>`. The solution should re-run setup from §7 (create table, insert data) then run the three KNN queries.

edu/.beans/archive/edu-pdeo--7-exercise-1-storing-and-retrieving-vectors.md

@@ -1,10 +1,13 @@
-+++
-title = "§7 Exercise 1: Storing and Retrieving Vectors"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-pdeo
+title: '§7 Exercise 1: Storing and Retrieving Vectors'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:29:59Z
+updated_at: 2026-03-10T23:29:59Z
+---
+
 ## §7 Exercise 1 — Storing and Retrieving Vectors — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 7. Exercise 1 — Storing and Retrieving Vectors`
@@ -71,4 +74,4 @@ SELECT id, label, vector_extract(embedding) FROM items ORDER BY id
 
 ## Cargo.toml additions
 
-Add `serde_json = "1"` for JSON array parsing.
+Add `serde_json = "1"` for JSON array parsing.

edu/.beans/archive/edu-pvou--write-10-integrating-a-neural-network-crate.md

@@ -0,0 +1,14 @@
+---
+# edu-pvou
+title: 'Write §10: Integrating a neural network crate'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T23:11:44Z
+parent: edu-coqp
+---
+
+Reading lesson: evaluate tch-rs vs candle for this use case; show how to define and initialise the network; basic forward-pass usage.
+
+## Summary of Changes\n\nWrote full content for §10 covering from-scratch neural network implementation in Rust: Layer struct, forward pass with ReLU/softmax/tanh, illegal move masking, Xavier initialization, backpropagation, SGD training, and complete compilable code.

edu/.beans/archive/edu-pyue--14-generating-c-definitions-and-functions.md

@@ -1,10 +1,12 @@
-+++
-title = "§14 Generating C: Definitions and Functions"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-pyue
+title: '§14 Generating C: Definitions and Functions'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
 
 ## §14 Generating C: Definitions and Functions — Stub to fill
 

edu/.beans/archive/edu-svom--markov.md

@@ -1,8 +1,11 @@
-+++
-title = "markov"
-priority = 7
-status = "done"
-ticket_type = "project"
-dependencies = ["fbf323", "738be2", "44ebe7", "257a2a", "64826a", "92a829", "74be50", "1f995a", "68ee16", "5994a6"]
-+++
-Self-guided Markov chain course in edu/markov.md.\n\nThe course outline lives in edu/markov.md. Each of the 10 section tickets must be completed to flesh out all stubs before this project is done.\n\nSections:\n1. fbf323 — What Is a Markov Chain?\n2. 738be2 — States and Transitions\n3. 44ebe7 — Transition Probabilities and Matrices\n4. 257a2a — Exercise 1: Weather Model (Rust)\n5. 64826a — Exercise 2: Random Walk (Rust)\n6. 92a829 — Text Generation with Markov Chains\n7. 74be50 — Exercise 3: Bigram Text Generator (Rust)\n8. 1f995a — Exercise 4: N-gram Generalization (Rust)\n9. 68ee16 — Stationary Distributions\n10. 5994a6 — Applications and Further Reading
+---
+# edu-svom
+title: markov
+status: completed
+type: epic
+priority: high
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-13T22:33:43Z
+---
+
+Self-guided Markov chain course in edu/markov.md.\n\nThe course outline lives in edu/markov.md. Each of the 10 section tickets must be completed to flesh out all stubs before this project is done.\n\nSections:\n1. fbf323 — What Is a Markov Chain?\n2. 738be2 — States and Transitions\n3. 44ebe7 — Transition Probabilities and Matrices\n4. 257a2a — Exercise 1: Weather Model (Rust)\n5. 64826a — Exercise 2: Random Walk (Rust)\n6. 92a829 — Text Generation with Markov Chains\n7. 74be50 — Exercise 3: Bigram Text Generator (Rust)\n8. 1f995a — Exercise 4: N-gram Generalization (Rust)\n9. 68ee16 — Stationary Distributions\n10. 5994a6 — Applications and Further Reading

edu/.beans/archive/edu-twtl--3-vector-similarity.md

@@ -1,10 +1,13 @@
-+++
-title = "§3 Vector Similarity"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-twtl
+title: §3 Vector Similarity
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
+
 ## §3 Vector Similarity — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 3. Vector Similarity`
@@ -34,4 +37,4 @@ This is a **reading lesson with inline math** — no Rust code. Target 400–600
 
 **When to use each.** Text and sentence embeddings: cosine (or dot product if model outputs unit vectors, which many do). Follow the model card's recommendation when specified. Low-dimensional geometric features: L2.
 
-**Worked example.** Use vectors a = [1, 0, 1] and b = [1, 1, 0]. Compute all three by hand and show the arithmetic step by step. Cosine similarity = 0.5, L2 distance ≈ 1.414, dot product = 1. This concretises the formulas before the reader sees them in SQL queries.
+**Worked example.** Use vectors a = [1, 0, 1] and b = [1, 1, 0]. Compute all three by hand and show the arithmetic step by step. Cosine similarity = 0.5, L2 distance ≈ 1.414, dot product = 1. This concretises the formulas before the reader sees them in SQL queries.

edu/.beans/archive/edu-tx54--deploy-edu-mdbook-to-cloudflare-pages-at-vibebooks.md

@@ -0,0 +1,77 @@
+---
+# edu-tx54
+title: Deploy edu mdbook to Cloudflare Pages at vibebooks.elijah.run
+status: completed
+type: epic
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
+
+## Background
+
+From `edu/TODO.md`:
+- Host the mdbook on Cloudflare Pages
+- Host on vibebooks.elijah.run
+- Create an `infra/` directory containing opentofu configs for the above
+- Add a big disclaimer about the content being AI-generated
+
+## Sub-tasks
+
+### 1. Add AI-generated disclaimer
+
+Add a prominent disclaimer page or preface to the mdbook. The disclaimer should say (in the user's words):
+> these [chapters] are AI generated and not intended to be definitive, trustworthy, or even good, just an experiment in generating tailored educational content about topics I am interested in but not sure where to start, and with a practical focus on exercises with Rust since that is the language I use most often
+
+Placement options:
+- A dedicated `src/disclaimer.md` page added first in `src/SUMMARY.md`
+- Or a callout block at the top of every chapter (requires mdbook preprocessor)
+- Recommended: `src/disclaimer.md` as the first page, with a short note in each chapter's preamble
+
+### 2. Create `edu/infra/` with OpenTofu configs
+
+Follow the pattern from `quotesdb/infra/` (Cloudflare provider, tofu modules).
+
+Minimal resources:
+- `cloudflare_pages_project` — create the Pages project named `vibedbooks`
+- `cloudflare_pages_domain` — bind `vibebooks.elijah.run` to the Pages project
+- `cloudflare_record` — CNAME DNS record pointing `vibebooks` at the Pages subdomain
+
+File layout:
+```
+edu/infra/
+├── main.tf          # provider config, cloudflare_pages_project
+├── dns.tf           # cloudflare_record and cloudflare_pages_domain
+├── variables.tf     # cloudflare_account_id, cloudflare_zone_id, etc.
+├── outputs.tf       # pages subdomain URL
+└── .gitignore       # *.tfstate, .terraform/
+```
+
+All `resource` and `data` blocks must have a comment explaining their purpose (per CLAUDE.md conventions).
+
+### 3. Configure mdbook build for CF Pages
+
+Cloudflare Pages can auto-build mdbook sites if given the right build command and output directory. Set in the Pages project config:
+- Build command: `mdbook build`
+- Build output directory: `book`
+- Root directory: `edu/`
+
+Alternatively, use a CI/CD pipeline (GitHub Actions / Gitea Actions) to build and push to the Pages project via `wrangler pages deploy`.
+
+### 4. Add edu/justfile
+
+Add a `release` recipe to `edu/justfile` (see justfiles ticket) that triggers the Pages deployment once infra is configured.
+
+## Relevant files
+
+- `edu/book.toml` — mdbook configuration
+- `edu/src/SUMMARY.md` — add disclaimer page
+- `edu/src/disclaimer.md` (new)
+- `edu/infra/` (new directory)
+- Cloudflare dashboard: Pages project, DNS zone `elijah.run`
+
+## Validation
+
+- `tofu validate && tofu plan` from `edu/infra/`
+- `mdbook build` from `edu/` — builds without errors
+- After deploy: `curl -I https://vibebooks.elijah.run` returns 200

edu/.beans/archive/edu-tzzh--9-parsing-s-expressions-and-special-forms.md

@@ -1,10 +1,12 @@
-+++
-title = "§9 Parsing S-Expressions and Special Forms"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-tzzh
+title: §9 Parsing S-Expressions and Special Forms
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
 
 ## §9 Parsing S-Expressions and Special Forms — Stub to fill
 

edu/.beans/archive/edu-unus--15-generating-c-control-flow-and-sequencing.md

@@ -1,10 +1,12 @@
-+++
-title = "§15 Generating C: Control Flow and Sequencing"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-unus
+title: '§15 Generating C: Control Flow and Sequencing'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
 
 ## §15 Generating C: Control Flow and Sequencing — Stub to fill
 

edu/.beans/archive/edu-urpp--markov-lesson-stationary-distributions.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov lesson: Stationary Distributions"
-priority = 7
-status = "done"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 9 of edu/markov.md: 'Stationary Distributions'\n\nLearning objectives:\n- Define stationary distribution π: πP = π, Σπᵢ = 1\n- Explain existence and uniqueness conditions: irreducibility and aperiodicity\n- Show how to compute π analytically for a 2-state chain\n- Introduce power iteration as a numerical method\n- Connect to the long-run frequency interpretation from the simulation in Exercise 1\n\nContent to produce:\n- 4–6 paragraphs of prose\n- Worked 2×2 example: solve πP = π by hand\n- Power iteration pseudocode or brief Rust sketch\n\nTarget: replace the stub in edu/markov.md §9
+---
+# edu-urpp
+title: 'Markov lesson: Stationary Distributions'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-13T22:37:26Z
+parent: edu-svom
+---
+
+Write Section 9 of edu/markov.md: 'Stationary Distributions'\n\nLearning objectives:\n- Define stationary distribution π: πP = π, Σπᵢ = 1\n- Explain existence and uniqueness conditions: irreducibility and aperiodicity\n- Show how to compute π analytically for a 2-state chain\n- Introduce power iteration as a numerical method\n- Connect to the long-run frequency interpretation from the simulation in Exercise 1\n\nContent to produce:\n- 4–6 paragraphs of prose\n- Worked 2×2 example: solve πP = π by hand\n- Power iteration pseudocode or brief Rust sketch\n\nTarget: replace the stub in edu/markov.md §9

edu/.beans/archive/edu-uz3e--5-under-the-hood-ann-algorithms.md

@@ -1,10 +1,13 @@
-+++
-title = "§5 Under the Hood: ANN Algorithms"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-uz3e
+title: '§5 Under the Hood: ANN Algorithms'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
+
 ## §5 Under the Hood: ANN Algorithms — Stub to fill
 
 File: `edu/src/vector-db.md`, section `### 5. Under the Hood: ANN Algorithms`
@@ -58,4 +61,4 @@ IVFFlat requires a training step before data can be inserted. Incremental insert
 | Insert | Incremental | Batch (requires training) |
 | Memory | Higher (graph edges) | Lower |
 | Recall@10 at defaults | ~0.95+ | ~0.90+ (depends on nprobe) |
-| Used by | sqlite-vec, Qdrant, Weaviate | pgvector, Faiss |
+| Used by | sqlite-vec, Qdrant, Weaviate | pgvector, Faiss |

edu/.beans/archive/edu-v0ud--17-testing-the-compiler.md

@@ -1,10 +1,12 @@
-+++
-title = "§17 Testing the Compiler"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-v0ud
+title: §17 Testing the Compiler
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
 
 ## §17 Testing the Compiler — Stub to fill
 

edu/.beans/archive/edu-wobk--write-1-what-is-reinforcement-learning.md

@@ -0,0 +1,14 @@
+---
+# edu-wobk
+title: 'Write §1: What is reinforcement learning?'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T22:46:18Z
+parent: edu-coqp
+---
+
+Cover: state, action, reward, policy, value function. Intuitive explanation with a game-playing example. No code.
+
+## Summary of Changes\n\nWrote full content for §1 covering RL fundamentals: agent/environment loop, state/action/reward/policy/value concepts, contrast with supervised/unsupervised learning, and why RL fits games.

edu/.beans/archive/edu-y4e6--18-whats-next-extensions-and-further-reading.md

@@ -1,10 +1,12 @@
-+++
-title = "§18 What's Next: Extensions and Further Reading"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-y4e6
+title: '§18 What''s Next: Extensions and Further Reading'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-10T23:30:00Z
+---
 
 ## §18 What's Next: Extensions and Further Reading — Stub to fill
 

edu/.beans/archive/edu-ylb8--1-introduction-what-were-building.md

@@ -1,10 +1,12 @@
-+++
-title = "§1 Introduction: What We're Building"
-priority = 5
-status = "todo"
-ticket_type = "task"
-dependencies = []
-+++
+---
+# edu-ylb8
+title: '§1 Introduction: What We''re Building'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-10T23:30:02Z
+updated_at: 2026-03-10T23:30:02Z
+---
 
 ## §1 Introduction: What We're Building — Stub to fill
 

edu/.beans/archive/edu-ymux--write-6-exercise-1-implement-tic-tac-toe-game-logi.md

@@ -0,0 +1,14 @@
+---
+# edu-ymux
+title: 'Write §6: Exercise 1 — implement Tic-Tac-Toe game logic'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T20:03:17Z
+updated_at: 2026-03-13T22:58:06Z
+parent: edu-coqp
+---
+
+Hands-on exercise: move generation, win detection, terminal-state check, displaying the board. Include starter code and expected test output.
+
+## Summary of Changes\n\nWrote full content for §6: Exercise 1 with project setup instructions, 8 unit test specifications with collapsible solutions, a random-game main function, and a readiness checklist.

edu/.beans/archive/edu-zjy1--markov-lesson-states-and-transitions.md

@@ -1,8 +1,12 @@
-+++
-title = "Markov lesson: States and Transitions"
-priority = 7
-status = "done"
-ticket_type = "task"
-dependencies = []
-+++
-Write Section 2 of edu/markov.md: 'States and Transitions'\n\nLearning objectives:\n- Define state space (finite vs countably infinite)\n- Define a transition as a directed edge between states with an associated probability\n- Introduce state-transition diagrams and how to draw them\n- Distinguish absorbing states, transient states, and recurrent states at an intuitive level\n\nContent to produce:\n- 3–5 paragraphs of prose\n- A hand-drawn-style ASCII or described state-transition diagram for the weather example\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §2
+---
+# edu-zjy1
+title: 'Markov lesson: States and Transitions'
+status: completed
+type: task
+priority: high
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-13T22:37:25Z
+parent: edu-svom
+---
+
+Write Section 2 of edu/markov.md: 'States and Transitions'\n\nLearning objectives:\n- Define state space (finite vs countably infinite)\n- Define a transition as a directed edge between states with an associated probability\n- Introduce state-transition diagrams and how to draw them\n- Distinguish absorbing states, transient states, and recurrent states at an intuitive level\n\nContent to produce:\n- 3–5 paragraphs of prose\n- A hand-drawn-style ASCII or described state-transition diagram for the weather example\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §2

edu/.beans/edu-10m1--9-exercise-2-draw-a-coloured-triangle.md

@@ -0,0 +1,12 @@
+---
+# edu-10m1
+title: '§9 Exercise 2: draw a coloured triangle'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:52Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the exercise to draw a hard-coded coloured triangle: define three vertices in a vertex buffer, write a vertex shader that passes colour through, write a fragment shader that outputs the interpolated colour. First rendered geometry. Part 3 of the Shader Programming chapter.

edu/.beans/edu-1nox--17-signed-distance-fields-for-font-rendering.md

@@ -0,0 +1,12 @@
+---
+# edu-1nox
+title: §17 Signed Distance Fields for font rendering
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:55:11Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the conceptual section on SDFs for font rendering: what an SDF encodes, why it scales better than bitmaps, how to threshold and anti-alias in the fragment shader. Brief — reading and intuition only. Part 6 of the Shader Programming chapter.

edu/.beans/edu-2ak3--3-what-is-wgsl-syntax-overview.md

@@ -0,0 +1,12 @@
+---
+# edu-2ak3
+title: §3 What is WGSL? Syntax overview
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:41Z
+updated_at: 2026-03-16T02:30:27Z
+parent: edu-4u7w
+---
+
+Write the WGSL syntax overview: types (scalars, vectors, matrices), functions, entry points, built-in variables (@vertex, @fragment, @builtin), uniforms and bindings. Show annotated snippets of a minimal vertex+fragment shader pair. Part 1 of the Shader Programming chapter.

edu/.beans/edu-2sqo--13-compute-pipelines-dispatching-work-groups.md

@@ -0,0 +1,12 @@
+---
+# edu-2sqo
+title: '§13 Compute pipelines: dispatching work groups'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:55:02Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the lesson on compute shaders: ComputePipeline vs RenderPipeline, dispatch_workgroups, workgroup size declarations in WGSL, global_invocation_id and how threads are indexed. Part 5 of the Shader Programming chapter.

edu/.beans/edu-32xl--write-1-what-is-a-language-model.md

@@ -0,0 +1,12 @@
+---
+# edu-32xl
+title: 'Write §1: What is a language model?'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:01:47Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Next-token prediction as the core task. Intuitive framing: a model that guesses what comes next, trained on raw text. GPT-1 context. No code.

edu/.beans/edu-3l9h--7-vertices-buffers-and-the-vertex-shader.md

@@ -0,0 +1,12 @@
+---
+# edu-3l9h
+title: §7 Vertices, buffers, and the vertex shader
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:49Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the lesson on vertex data: vertex structs in Rust, VertexBufferLayout, uploading a buffer to the GPU with wgpu::util::DeviceExt, and what the vertex shader receives (position, colour, normals). Part 3 of the Shader Programming chapter.

edu/.beans/edu-4u7w--edu-write-chapter-on-shader-programming.md

@@ -0,0 +1,56 @@
+---
+# edu-4u7w
+title: 'edu: write chapter on shader programming'
+status: completed
+type: feature
+priority: low
+created_at: 2026-03-10T23:30:00Z
+updated_at: 2026-03-16T02:32:28Z
+---
+
+## Background
+
+From `edu/TODO.md`: Hands-on: Shader programming.
+
+A practical introduction to GPU shaders, written with Rust as the host language. The course covers the graphics pipeline conceptually and has hands-on exercises writing WGSL shaders driven by `wgpu`.
+
+## Content outline (suggested)
+
+### Part 1 — The GPU and the Graphics Pipeline
+1. CPU vs GPU: parallel execution model
+2. The programmable pipeline: vertex shaders, fragment shaders, compute shaders
+3. What is WGSL? (WebGPU Shading Language) — syntax overview
+
+### Part 2 — Setting Up with wgpu
+4. What is `wgpu`? Cross-platform graphics API in Rust
+5. Exercise 1: Create a window and clear it to a colour (the GPU 'hello world')
+6. The render loop: swap chains, frames, command encoders
+
+### Part 3 — Vertex and Fragment Shaders
+7. Vertices, buffers, and the vertex shader
+8. Interpolation and the fragment shader
+9. Exercise 2: Draw a coloured triangle
+10. Exercise 3: Animate the triangle using a time uniform
+
+### Part 4 — Textures and Samplers
+11. Texture coordinates (UVs), texture creation, sampler config
+12. Exercise 4: Render a textured quad
+
+### Part 5 — Compute Shaders
+13. Compute pipelines: dispatching work groups
+14. Storage buffers and read/write access from WGSL
+15. Exercise 5: GPU-accelerate a particle simulation
+
+### Part 6 — Going Further
+16. Post-processing effects (bloom, blur) — conceptual overview
+17. Signed Distance Fields for font rendering
+18. Resources: Learn WGPU tutorial, Shadertoy, The Book of Shaders
+
+## File to create
+
+- `edu/src/shaders.md`
+- Add to `edu/src/SUMMARY.md` under a `# Graphics` section
+
+## Summary of Changes
+
+All 18 sections written with full educational content covering the GPU execution model, wgpu setup, vertex/fragment shaders, textures, compute shaders, and advanced topics. ~4400 lines of content including full Rust+WGSL code examples, ASCII diagrams, and 5 hands-on exercises.

edu/.beans/edu-5g0l--1-cpu-vs-gpu-parallel-execution-model.md

@@ -0,0 +1,12 @@
+---
+# edu-5g0l
+title: '§1 CPU vs GPU: parallel execution model'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:37Z
+updated_at: 2026-03-16T02:30:27Z
+parent: edu-4u7w
+---
+
+Write the lesson on the CPU vs GPU execution model: SIMD vs SIMT, thread hierarchies (threads, warps/waves, workgroups), why GPUs excel at data-parallel work and struggle with branching. Part 1 of the Shader Programming chapter.

edu/.beans/edu-6jjp--5-exercise-1-create-a-window-and-clear-it-to-a-col.md

@@ -0,0 +1,12 @@
+---
+# edu-6jjp
+title: '§5 Exercise 1: create a window and clear it to a colour'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:44Z
+updated_at: 2026-03-16T02:30:27Z
+parent: edu-4u7w
+---
+
+Write the first hands-on exercise: create a winit window, initialise a wgpu surface, and clear it to a solid colour each frame. Walk through Instance → Adapter → Device → Surface → RenderPass with annotated Rust code. The GPU hello world. Part 2 of the Shader Programming chapter.

edu/.beans/edu-7do4--write-2-character-level-tokenisation.md

@@ -0,0 +1,12 @@
+---
+# edu-7do4
+title: 'Write §2: Character-level tokenisation'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:01:48Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Explain BPE vs byte-level vs character-level. Motivate character-level as the simplest choice for a from-scratch exercise. Show vocabulary construction.

edu/.beans/edu-7m8d--18-resources-learn-wgpu-shadertoy-the-book-of-shad.md

@@ -0,0 +1,12 @@
+---
+# edu-7m8d
+title: '§18 Resources: Learn WGPU, Shadertoy, The Book of Shaders'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:55:12Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the resources and next-steps section: links and descriptions for the Learn WGPU tutorial, Shadertoy for experimentation, The Book of Shaders for mathematical foundations, and any other curated pointers. Part 6 of the Shader Programming chapter.

edu/.beans/edu-9cnd--write-6-the-transformer-block.md

@@ -0,0 +1,12 @@
+---
+# edu-9cnd
+title: 'Write §6: The Transformer block'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:01:55Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Attention sublayer + 2-layer feed-forward network + residual connections + layer norm. Describe the GPT-1 block layout. Diagrams encouraged.

edu/.beans/edu-9lda--16-post-processing-effects-bloom-blur-conceptual-o.md

@@ -0,0 +1,12 @@
+---
+# edu-9lda
+title: '§16 Post-processing effects (bloom, blur): conceptual overview'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:55:11Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the conceptual overview of post-processing: render to texture (off-screen framebuffer), Gaussian blur as a separable two-pass compute shader, bloom as blur applied to bright regions. No full exercise — reading only. Part 6 of the Shader Programming chapter.

edu/.beans/edu-9sb7--write-14-further-reading.md

@@ -0,0 +1,12 @@
+---
+# edu-9sb7
+title: 'Write §14: Further reading'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:02:08Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Curated pointers: Attention is All You Need paper, GPT-1 paper, Karpathy's nanoGPT, candle docs, The Illustrated Transformer blog post.

edu/.beans/edu-abdu--write-10-cross-entropy-loss-and-the-training-loop.md

@@ -0,0 +1,12 @@
+---
+# edu-abdu
+title: 'Write §10: Cross-entropy loss and the training loop'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:02:02Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Next-token prediction loss: cross-entropy over the vocab. Adam optimiser. Training loop structure: batch → forward → loss → backward → step. No bells and whistles.

edu/.beans/edu-al3r--edu-write-chapter-on-co-op-worker-owned-business-s.md

@@ -0,0 +1,34 @@
+---
+# edu-al3r
+title: 'edu: write chapter on co-op worker-owned business structure'
+status: todo
+type: task
+priority: low
+created_at: 2026-03-10T23:30:01Z
+updated_at: 2026-03-10T23:30:01Z
+---
+
+## Background
+
+From `edu/TODO.md`: write a chapter about how to structure a co-op profit-sharing worker-owned business.
+
+This is a conceptual/informational chapter, not a Rust hands-on. It fits naturally in the Vibed Learning book as a practical guide for engineers who might want to start or join a worker cooperative.
+
+## Content outline (suggested)
+
+1. **What is a worker cooperative?** — definition, historical examples, how they differ from traditional businesses
+2. **Legal structures** — co-op incorporation options by jurisdiction (US LCA/LLC, UK LLP, etc.), relevant legislation
+3. **Profit sharing models** — patronage dividends, equal shares, labor-hour weighted, hybrid approaches
+4. **Governance** — one-member-one-vote, board structure, decision-making processes
+5. **Practical startup steps** — founding documents, initial capital, operating agreements
+6. **Case studies** — Mondragon, REI, Cooperative Home Care Associates, tech co-ops (Loomio, etc.)
+7. **Resources and further reading**
+
+## File to create
+
+- `edu/src/co-op.md`
+- Add to `edu/src/SUMMARY.md` under a new `# Business` section (or `# Other Topics`)
+
+## Notes
+
+This chapter is explicitly not intended to be authoritative legal or financial advice — add the standard AI-generated disclaimer.

edu/.beans/edu-bycd--11-texture-coordinates-uvs-texture-creation-sample.md

@@ -0,0 +1,12 @@
+---
+# edu-bycd
+title: §11 Texture coordinates (UVs), texture creation, sampler config
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:56Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the lesson on textures: UV coordinates, wgpu texture creation from image data, TextureView, Sampler configuration (filter modes, address modes), and bind group layout for textures. Part 4 of the Shader Programming chapter.

edu/.beans/edu-cr0w--10-exercise-3-animate-the-triangle-using-a-time-un.md

@@ -0,0 +1,12 @@
+---
+# edu-cr0w
+title: '§10 Exercise 3: animate the triangle using a time uniform'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:54Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the exercise to animate the coloured triangle: introduce uniform buffers, upload a time value each frame, rotate or pulse the triangle in the vertex shader using the time uniform. Introduces the uniform/bind-group pattern. Part 3 of the Shader Programming chapter.

edu/.beans/edu-cw9v--write-4-embeddings-and-positional-encoding.md

@@ -0,0 +1,12 @@
+---
+# edu-cw9v
+title: 'Write §4: Embeddings and positional encoding'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:01:52Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Token embedding table (vocab_size × d_model). Learned positional embeddings (GPT-1 style). Explain why position matters for attention.

edu/.beans/edu-exby--15-exercise-5-gpu-accelerate-a-particle-simulation.md

@@ -0,0 +1,12 @@
+---
+# edu-exby
+title: '§15 Exercise 5: GPU-accelerate a particle simulation'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:55:05Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the compute shader exercise: implement an N-body or simple gravity particle simulation. Store particle positions and velocities in storage buffers, update them in a compute shader each frame, render the result as points. Part 5 of the Shader Programming chapter.

edu/.beans/edu-ga8p--8-interpolation-and-the-fragment-shader.md

@@ -0,0 +1,12 @@
+---
+# edu-ga8p
+title: §8 Interpolation and the fragment shader
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:50Z
+updated_at: 2026-03-16T02:30:28Z
+parent: edu-4u7w
+---
+
+Write the lesson on rasterisation and interpolation: how values output from the vertex shader are interpolated across fragments, what the fragment shader receives and outputs (colour), and how the pipeline assembles a final image. Part 3 of the Shader Programming chapter.

edu/.beans/edu-hrfy--6-the-render-loop-swap-chains-frames-command-encod.md

@@ -0,0 +1,12 @@
+---
+# edu-hrfy
+title: '§6 The render loop: swap chains, frames, command encoders'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:44Z
+updated_at: 2026-03-16T02:30:27Z
+parent: edu-4u7w
+---
+
+Write the lesson on the wgpu render loop: SurfaceTexture acquisition, CommandEncoder, RenderPass, queue submission, present. Explain double/triple buffering conceptually. Part 2 of the Shader Programming chapter.

edu/.beans/edu-hufe--write-7-exercise-2-implement-self-attention-in-rus.md

@@ -0,0 +1,12 @@
+---
+# edu-hufe
+title: 'Write §7: Exercise 2 — implement self-attention in Rust'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:01:56Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Implement scaled dot-product attention using candle tensors. Single head, causal mask, softmax, output projection. Reader writes the core attention function.

edu/.beans/edu-i76z--write-12-exercise-5-sample-from-the-model.md

@@ -0,0 +1,12 @@
+---
+# edu-i76z
+title: 'Write §12: Exercise 5 — sample from the model'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:02:05Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Temperature sampling and greedy decoding. Prompt the trained model and decode character-by-character. Compare output at different training checkpoints.

edu/.beans/edu-j35d--4-what-is-wgpu-cross-platform-graphics-api-in-rust.md

@@ -0,0 +1,12 @@
+---
+# edu-j35d
+title: §4 What is wgpu? Cross-platform graphics API in Rust
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T19:54:43Z
+updated_at: 2026-03-16T02:30:27Z
+parent: edu-4u7w
+---
+
+Write the wgpu introduction: what it is, how it maps to WebGPU/Vulkan/Metal/D3D12, the key types (Instance, Adapter, Device, Queue, Surface), and how it differs from OpenGL. Part 2 of the Shader Programming chapter.

edu/.beans/edu-jybf--write-11-exercise-4-train-on-a-small-text-corpus.md

@@ -0,0 +1,12 @@
+---
+# edu-jybf
+title: 'Write §11: Exercise 4 — train on a small text corpus'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:02:04Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Use a small public-domain text (e.g. Shakespeare's sonnets or a children's book). Show data loading, batching with random windows, training loop, loss curve. Reader runs training and watches loss fall.

edu/.beans/edu-kkjc--write-13-what-limits-this-model.md

@@ -0,0 +1,12 @@
+---
+# edu-kkjc
+title: 'Write §13: What limits this model?'
+status: completed
+type: task
+priority: normal
+created_at: 2026-03-13T22:02:07Z
+updated_at: 2026-03-16T02:30:26Z
+parent: edu-u2w7
+---
+
+Honest assessment: context length, data size, model capacity, compute. Explain why GPT-1 was a big deal in 2018 and what GPT-2/3/4 changed. No code.