/claim #71

Summary

• Add focused tests for handler request validation, pre-auth plugin routing, the external source guard, transaction params, and cache cleanup logging.
• Keep production code unchanged.

Demo video

• https://files.catbox.moe/r4nka1.mp4

Verification

• pnpm exec vitest run src/handler.test.ts
• pnpm exec vitest run src/handler.test.ts –coverage –coverage.include=src/handler.ts –coverage.thresholds.lines=0 –coverage.thresholds.branches=0 –coverage.thresholds.functions=0 –coverage.thresholds.statements=0
• pnpm exec prettier –check src/handler.test.ts
• git diff –check

Note

• Full current-main coverage run still hits the existing RLS expectation failures in src/rls/index.test.ts; this PR only changes handler tests and the focused handler verification passes locally.