test(config-audit): add Opus 4.7 pattern fixtures (cache, redundant, imports, sonnet-era)

tests/fixtures/opus-47/deep-imports/layer3.md

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+# 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.