nix: split flake into package.nix + lean dev shell#335
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Restructures the flake so `nix build .#` and `nix run .#` produce a working msgvault binary, and the devShell stays focused on dev tools rather than quietly pulling the application's build closure on every `cd`. Changes: - Move the buildGoModule call into `nix/package.nix`; the top-level flake wires inputs and exposes per-system outputs via flake-utils - Add `sqlite` to `buildInputs` so `sqlite-vec-go-bindings` finds `sqlite3.h` (this is the cause `nix build` failed before, even though the package block existed) - Set both `fts5` and `sqlite_vec` build tags, matching the Makefile - Filter source through `gitignore.nix` so the build closure doesn't include `.direnv`, `.claude`, etc. - Expose `apps.default` so `nix run .#` resolves to the msgvault binary - Add `gopls`, `gotools`, `delve`, and `sqlite-interactive` to the devShell alongside the existing go/golangci-lint/gcc/prek Update `scripts/update-nix-flake.sh` to sed `nix/package.nix` instead of `flake.nix`, since `vendorHash` and `version` now live there.
Routine flake.lock refresh. Go 1.26.2 in this nixpkgs revision; the goPinned override to 1.26.3 still applies.
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Summary
flake.nixnow wires inputs and exposespackages.default,apps.default, anddevShells.defaultvia flake-utilsnix/package.nixnix build .#andnix run .#produce a working msgvault binary; the prior block was missingsqliteinbuildInputs, sosqlite-vec-go-bindingscouldn't findsqlite3.hsqlite_vecbuild tag added to match the Makefilegitignore.nixso.direnv,.claude, etc. stay out of the build closuredevShellkeeps Go 1.26.3 / golangci-lint / gcc / prek and addsgopls,gotools,delve,sqlite-interactivescripts/update-nix-flake.shnow sedsnix/package.nixinstead offlake.nixUsage