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+# AI Agent Rules - Live_RC (Linux/Node.js)
+
+## Environment & Tech Stack
+- **OS:** Linux (Ubuntu/Debian architecture)
+- **Runtime:** Node.js v22/v24 LTS, npm 10+
+- **Core:** Vanilla JavaScript, HTML5, SQLite (`data/rc_timing.sqlite`)
+- **Tests:** Native Node.js test runner (`npm test`)
+- **Binaries:** GLIBC 2.39+ compatible tools in `AMMC/linux_x86-64/`
+
+## Critical Token & Kvot Optimization
+1. **Compact Output Only:** NEVER rewrite or output whole files (e.g., `server.js` or `src/app.js`). Only output the exact lines, functions, or unified diffs that change.
+2. **Git Hygiene:** Use `git status` or `git diff --stat` to inspect the workspace. Do not pipe huge `git diff` outputs into the context window.
+3. **Ignore Data & Binaries:** Completely ignore the `data/` directory, `logs/`, and `AMMC/` binaries. Do not scan them.
+
+## Linux Runtime Commands
+Always use these exact Linux commands for management:
+- Start Background: `npm start`
+- Start Foreground (Debug): `npm run start:fg`
+- Stop Server: `npm stop`
+- Check Status: `npm run status`
+- Run Tests: `npm test` (Runs on isolated temporary port)
+
+## Code & Git Conventions
+- **Commits:** Conventional Commits (e.g., `fix(lap): repair split calculations`, `feat(audio): add linux sound trigger`).
+- **File System:** Ensure `chmod +x` commands are suggested if modifying scripts under `scripts/` or `AMMC/`.
+- Always respect frontend `localStorage` to backend SQLite synchronization.