Run Biome formatter and add formatting guidance to CLAUDE.md

CLAUDE.md

@@ -35,6 +35,8 @@ npm run dev                          # Start daemon + Expo in Tmux
 npm run cli -- ls -a -g              # List all agents
 npm run cli -- daemon status         # Check daemon status
 npm run typecheck                    # Always run after changes
+npm run format                       # Auto-format with Biome
+npm run format:check                 # Check formatting without writing
 ```
 
 See [docs/DEVELOPMENT.md](docs/DEVELOPMENT.md) for full setup, build sync requirements, and debugging.
@@ -45,6 +47,7 @@ See [docs/DEVELOPMENT.md](docs/DEVELOPMENT.md) for full setup, build sync requir
 - **NEVER assume a timeout means the service needs restarting** — timeouts can be transient.
 - **NEVER add auth checks to tests** — agent providers handle their own auth.
 - **Always run typecheck after every change.**
+- **Run `npm run format` before committing.** This repo uses Biome for formatting. Do not manually fix formatting — let the formatter handle it.
 - **NEVER make breaking changes to WebSocket or message schemas.** The primary compatibility path is old mobile app clients talking to newly updated daemons. Users update desktop and daemon first, then keep running the old app for a while. Every schema change MUST be backward-compatible for old clients against new daemons:
   - New fields: always `.optional()` with a sensible default or `.transform()` fallback.
   - Never change a field from optional to required.