feat(review): deterministic changed-file classifier (source/test/docs/config/generated)

[JSONbored]

Add a pure classifyChangedFile(path) that maps a changed file to one of source/test/docs/config/generated using the existing path-matchers, so the changed-files summary table (and future analytics) group deterministically. Pure function + tests only — no rendering; keeps the #1957 render slice small.

Deliverables

• New pure module (e.g. src/review/changed-files-classify.ts) classifyChangedFile(path): 'source'|'test'|'docs'|'config'|'generated'
• Compose from src/signals/path-matchers.ts: isGeneratedFile, isDocsFile, isConfigFile, isVendoredFile/isLockfile, plus isTestPath/isTestFile
• Fixed precedence (generated > test > docs > config > source) documented in a comment so the mapping is stable
• Tests: one file per class + precedence conflicts (e.g. a generated test file), lockfile/vendored → generated, unknown → source (both arms of each matcher)

References

• src/signals/path-matchers.ts:153
• src/signals/path-matchers.ts:182
• src/signals/path-matchers.ts:197
• src/review/review-diff.ts:16
• part of #1957

Part of #1957.

---

size: S · held for later release (gittensor:priority once activated)

[linear-code]

JSO-2245