Initial project scaffold

- flake.nix: Nix flake with crane-based Rust builds, rust-overlay for a
  pinned stable toolchain (with rust-analyzer, clippy, rust-src), and a
  devShell stocked with cargo-watch, cargo-edit, cargo-nextest, and beans
- Cargo.toml: minimal package manifest targeting Rust edition 2024
- Cargo.lock: generated lockfile
- src/main.rs: placeholder main entry point
- flake.lock: pinned flake input revisions
- .gitignore, .envrc, .beans.yml, .claude/settings.json: project tooling config

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

.beans.yml

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

.claude/settings.json

@@ -0,0 +1,15 @@
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "beans prime"
+          }
+        ]
+      }
+    ]
+  }
+}
+

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -0,0 +1,2 @@
+/target
+.direnv/

Cargo.lock

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

Cargo.toml

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

flake.lock

@@ -0,0 +1,98 @@
+{
+  "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1774313767,
+        "narHash": "sha256-hy0XTQND6avzGEUFrJtYBBpFa/POiiaGBr2vpU6Y9tY=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "3d9df76e29656c679c744968b17fbaf28f0e923d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1774386573,
+        "narHash": "sha256-4hAV26quOxdC6iyG7kYaZcM3VOskcPUrdCQd/nx8obc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "46db2e09e1d3f113a13c0d7b81e2f221c63b8ce9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "crane": "crane",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1774581174,
+        "narHash": "sha256-258qgkMkYPkJ9qpIg63Wk8GoIbVjszkGGPU1wbVHYTk=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "a313afc75b85fc77ac154bf0e62c36f68361fd0b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "claudbg";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    crane = {
+      url = "github:ipetkov/crane";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, crane, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs { inherit system overlays; };
+
+        rustToolchain = pkgs.rust-bin.stable.latest.default.override {
+          extensions = [ "rust-src" "rust-analyzer" "clippy" ];
+        };
+
+        craneLib = (crane.mkLib pkgs).overrideToolchain rustToolchain;
+
+        src = craneLib.cleanCargoSource ./.;
+
+        commonArgs = {
+          inherit src;
+          strictDeps = true;
+        };
+
+        cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+
+        claudbg = craneLib.buildPackage (commonArgs // {
+          inherit cargoArtifacts;
+        });
+      in
+      {
+        packages = {
+          default = claudbg;
+          inherit claudbg;
+        };
+
+        checks = {
+          inherit claudbg;
+
+          clippy = craneLib.cargoClippy (commonArgs // {
+            inherit cargoArtifacts;
+            cargoClippyExtraArgs = "--all-targets -- --deny warnings";
+          });
+
+          fmt = craneLib.cargoFmt { inherit src; };
+
+          tests = craneLib.cargoTest (commonArgs // {
+            inherit cargoArtifacts;
+          });
+        };
+
+        devShells.default = craneLib.devShell {
+          checks = self.checks.${system};
+          packages = with pkgs; [
+            rustToolchain
+            cargo-watch
+            cargo-edit
+            cargo-nextest
+            beans
+          ];
+        };
+      });
+}

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}