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

tests/fixtures/opus-47/deep-imports/layer1.md

@@ -0,0 +1,46 @@
+# Layer 1
+
+First layer of the deep import chain. Each layer contributes substantive
+content so the chain is not trivially dismissable as "all short stubs".
+
+## Section A
+
+Coding conventions for the fictitious project that exists solely to
+exercise the TOK scanner's import-depth detection logic.
+
+- Prefer async/await over raw Promises.
+- Annotate return types even when TypeScript can infer them.
+- Keep functions under 40 lines where practical.
+- Use `readonly` generously on types.
+- Dependency-inject side effects at module boundaries.
+- Validate inputs at system boundaries only.
+
+## Section B
+
+Error handling patterns:
+
+- Subclass `Error` with typed messages.
+- Never swallow errors silently.
+- Prefer `Result<T, E>` return types in business logic.
+- Log at boundaries, never inside pure functions.
+
+## Section C
+
+Testing patterns:
+
+- Test fixtures live under `tests/fixtures/{name}/`.
+- Each fixture has a single shape it exercises.
+- Use `describe(...)` + `it(...)` from `node:test`.
+- Prefer table-driven tests for permutations.
+- Keep test setup idempotent.
+
+## Section D
+
+CI/CD conventions:
+
+- Conventional Commits for every commit.
+- PR-free single-branch workflow on Forgejo.
+- Lint and typecheck on every push.
+- Release tags follow `{plugin}-v{semver}`.
+
+@layer2.md