[itsflaid]

Summary

• add retrieval query expansion terms and expose them in QuestionContext/JSON output
• enforce explicit relevance confidence thresholds and low-confidence local answers
• keep deterministic scoring in control so direct matches outrank inferred matches
• update Ask docs, PRD, and maintainer testing notes

Verification

• pnpm test:cli
• pnpm build:cli
• git diff --check

Closes #29