# Layer 3

Third layer of the chain — terminal leaf. Imported by layer2.md, imports
nothing further. Exists solely to make the chain 3-deep, tripping the
TOK scanner's import-depth detector.

## Release Checklist

- Version bumped in plugin manifest and package.json.
- CHANGELOG.md has an entry for the new version.
- README badges reflect the new version.
- All tests green on a clean working tree.
- Tag pushed to Forgejo alongside the main branch.

## Supported Platforms

- macOS Intel (primary development)
- macOS Apple Silicon (untested, considered compatible)
- Linux x86_64 (CI target)
- Windows (partial — managed-settings path missing)

## Known Gaps

- Windows managed-settings support deferred to a future release.
- Prompt-cache hit-rate measurement requires runtime telemetry.
- Token-cost calibration pending authoritative research.

## Hook Safety

- All hooks run in bounded time (timeout declared).
- Non-zero exit blocks the operation.
- Hook scripts never write outside the repository root.
- Hook scripts never modify `.git/hooks/` or shell configs.

## Rule Prioritisation

- Project rules override user rules.
- Rules with narrower paths win over broader ones.
- Conflicts trigger a CNF finding at high severity.
- Deprecated rule fields are rewritten on load.

## Closing Note

This terminal layer rounds out the chain to ensure the TOK scanner sees a
meaningful volume of imported content at each depth, not just a stub.