- Add concurrent PSI fetches with sliding-window rate limiter (2 req/sec)
- Add --psi-concurrency CLI flag (default 3, max 16)
- Add divergences array to JSON report (cross-page audit spread ≥ 20)
- Add markdownFile field for failing/errored pages
- Add pageCount to JSON envelope
- Add index.json.manifest.json for large site chunking
- Drop index.md — JSON is now the single source of truth
- Remove formatIndex() — breaking change
- Per-page .md files only written for failing/errored pages
- 71 tests passing