v3.33.4 — mmr skill install docs + knowledge freshness

Added

• mmr skill install documented in the mmr reference guide. The MMR CLI (shipped in @zigrivers/mmr v1.6.0) can install a "use MMR for code review" skill into a project for Cursor, Codex, Gemini, and Antigravity. The guide covers the per-platform targets — .cursor/rules/mmr-review.mdc, GEMINI.md, and a shared AGENTS.md managed block for Codex + Antigravity — and the idempotent managed-block behavior. The bundled content/skills/mmr skill gains a scope note recording packages/mmr/templates/skills/ as the source of truth for those platforms.

Changed

• Knowledge freshness refresh (10 backend entries) against current upstream sources with measured review/retrieval dates and source hashes: backend-worker-patterns, backend-testing, backend-security, backend-requirements, backend-project-structure, backend-observability, backend-fintech-testing, backend-fintech-risk-management, backend-fintech-order-lifecycle, backend-fintech-observability. KB VERSION → 0.1.8.