The cargo clippy and cargo fmt hooks ran from the repo root but the Rust project lives in rust/prop_grid_rs/. Add --manifest-path so they find the Cargo.toml and actually run.
- Add flake.nix + flake.lock pinning nixpkgs-unstable - Add nix/shell.nix with PostgreSQL, Rust, Elixir LSP, pre-commit hooks - Add shell.nix flake-compat shim for non-flake nix-shell users - Bump Dockerfile to Elixir 1.20.2 / OTP 29.0.3 - Add nix.md with setup and troubleshooting docs - Gitignore Nix runtime state and generated pre-commit config Co-Authored-By: Claude <noreply@anthropic.com>
