Shareable instruction files for Cursor, Claude Code, Copilot, Windsurf, and more — installed alongside your existing agent rules.
1. **Test-First Development** - Never write production code without failing test first 2. **Domain Isolation** - All domain logic tests MUST NOT contain Bevy/NATS dependencies 3. **Headless Execution** - All tests must run in BEVY_HEADLESS=1 mode with Wayland disabled