- Remove mkOpencodeRules backward-compat alias from lib/coding-rules.nix
- Remove opencode-rules alias from lib/default.nix
- Update shells/opencode.nix to use mkCodingRules / coding-rules
- Remove backward-compat test from tests/lib/coding-rules-test.nix
- Update AGENTS.md and modules/home-manager/AGENTS.md docs
- Apply nix fmt formatting to shared-options.nix
- Remove dead overlays/default.nix (flake defines overlays inline)
- Remove orphaned overlays/mods/{beads,n8n}.nix (never imported)
- Remove docs/packages/notesmd-cli.md (package doesn't exist)
- Extract externalSkills submodule to shared-options.nix (eliminates
~100 lines of duplication across opencode/claude-code/pi modules)
- Fix lib output: use nixpkgs.lib directly instead of instantiating
a full nixpkgs just to get lib
- Add lib unit tests to flake checks
- Update stale comment in coding-rules.nix
