---
"thumbgate": patch
---

Add mandatory implementation notes system: `.claude/implementation-notes/` directory for per-task decision logs, new CLAUDE.md section mandating their use, and new hard-won lesson from the 2026-05-20 deploy root-cause misdiagnosis. Adopted from @trq212's prompting pattern for keeping the CEO in the loop on decisions, tradeoffs, and corrections during multi-step tasks.
