feat(rag): expose knowledge improvement lifecycle

[drewstone]

Summary

• add runRagKnowledgeImprovementLoop as the public full-RAG lifecycle coordinator
• expose retrieval tuning, gap diagnosis, knowledge acquisition/update, answer-quality eval, and promotion as typed phases
• document the lifecycle boundary and clear repo lint issues that blocked biome

Verification

• pnpm exec biome check src tests
• pnpm exec tsc --noEmit
• pnpm exec vitest run tests/rag-improvement-loop.test.ts tests/retrieval-eval.test.ts tests/core.test.ts
• pnpm exec tsup
• pnpm exec vitest run

[tangletools]

✅ Auto-approved drewstone PR — 94ee66d4

This PR was opened by the trusted drewstone account.
The full PR reviewer audit still runs separately and will publish findings if it detects issues.

_{tangletools · auto-approval · reason: drewstone_author · 2026-07-07T20:15:10Z}