fix: resolve code quality issues, add CI, and improve maintainability

- Remove useless nixConfig block (cache.nixos.org is default)
- Remove manual container-use override; let blueprint auto-discover it
- Add nixosModules.default so README example works
- Fix default launcher: use correct parameterized flake URL
- Replace deprecated sha256 with hash in goose-cli fetchers
- Fix LIBCLANG_PATH to include /lib subdirectory for libclang.so
- Drop --release from goose-cli tests (faster, more debug info)
- Use builtins.toFile in flake-inputs to avoid ARG_MAX risk
- Add lib.warn when overlay has no packages for a system
- Add passthru.updateScript to goose-cli, container-use, skillsmcp
- Fix skillsmcp version to 0.2.0+unstable (pinned to commit, not tag)
- Replace with lib; with explicit references in all meta blocks
- Add update.py script for goose-cli (referenced in AGENTS.md)
- Expand .gitignore with result-* and .direnv/
- Add GitHub Actions CI workflow (nix flake check + build)

packages/flake-inputs/default.nix

@@ -4,8 +4,11 @@
   ...
 }:
 # A derivation that references all flake inputs to ensure they get cached
+let
+  inputsList = pkgs.lib.concatMapStringsSep " " (name: inputs.${name}) (builtins.attrNames inputs);
+in
 pkgs.runCommand "flake-inputs" { } ''
-  echo ${pkgs.lib.concatMapStringsSep " " (name: inputs.${name}) (builtins.attrNames inputs)} > $out
+  cat ${builtins.toFile "flake-inputs-list" inputsList} > $out
 ''
 // {
   passthru.hideFromDocs = true;