What problem does it solve? During founder sessions on Mac, agents can get stuck running heavy end-to-end validators for 11+ minutes, blocking responses and harming productivity. This Skill enforces strict session rules so agents reply fast, run only light checks, and defer heavy validation to cloud CI. ## Core Features & Use Cases - Validator Stall Prevention: Bans validator marathons, chained validate commands, and heavy build gates during founder sessions, with a hard 90-second limit on shell commands. - Receipt-Based Proof: Uses pre-generated receipt JSON files in ~/.sina/ as proof of state instead of re-running validation loops. - Light Health Checks: Permits quick curl health checks and single light script runs to confirm system state. - Use Case: A founder asks an agent on Mac whether the hub is healthy. Instead of running a full e2e suite, the agent curls the local health endpoint and reads the latest receipt file, answering in under 30 seconds. ## Quick Start Apply the hub-pro-mac-session rules and answer my question using only light checks and receipt files, without running any heavy validators.