## Summary
- Consolidate all agent coding instructions into `AGENTS.md`, which is the standard convention supported by multiple agentic coding tools (Claude Code, Cursor, Copilot, OpenCode, etc.)
- Slim down `CLAUDE.md` to a single `@AGENTS.md` reference so Claude Code inherits the shared instructions
- Added missing GitHub Action workflow section and `npx lint-staged` fallback to `AGENTS.md` to ensure full coverage of what was previously in `CLAUDE.md`