{
  "id": "6e4239",
  "title": "Nix flake for nbd",
  "body": "Add `nbd/flake.nix` so that `nbd` can be consumed as a Nix package and used as a CLI tool in other projects in the mono-repo.\n\n## Motivation\n\nOther `vibed` services and external projects should be able to include `nbd` as a dev dependency via Nix, getting a pinned, reproducible binary without needing Cargo installed.\n\n## Approach\n\n### nbd/flake.nix\n\nFollow the pattern from the repo root `flake.nix`. The service flake should:\n1. Inherit the base flake's inputs (nixpkgs, rust-overlay, etc.) or declare its own.\n2. Define a `packages.default` attribute that builds the `nbd` crate with `rustPlatform.buildRustPackage`.\n3. Define a `devShells.default` that includes the `nbd` binary and standard Rust tooling (rustfmt, clippy, cargo).\n4. Optionally expose an `apps.default` for `nix run .#nbd`.\n\n### Cargo.lock\nEnsure `Cargo.lock` is committed (it already is) — required for reproducible Nix builds.\n\n### cargoHash / cargoSha256\nThe `buildRustPackage` derivation requires a `cargoHash` (or `cargoSha256`). Use the correct fetcher approach (vendored deps or `fetchCargoTarball`).\n\n## Steps\n1. Read the root `flake.nix` to understand the base structure.\n2. Write `nbd/flake.nix` following the same conventions.\n3. Run `nix build .#nbd` from the `nbd/` directory to verify it builds.\n4. Run `nix run .#nbd -- --help` to verify the binary works.\n\n## Files touched\n- `nbd/flake.nix` — new file\n- `README.md` — add `nix run` usage section",
  "priority": 4,
  "status": "todo",
  "dependencies": [],
  "ticket_type": "task"
}