c3
This skill should be used when the user invokes /c3 or asks architecture questions about a project with a .c3/ directory. Trigger phrases: "adopt C3", "onboard this project", "where is X", "audit the architecture", "check docs", "add a component", "implement feature", "what breaks if I change X", "add a ref", "add a coding rule", "coding standard". Handles operations: onboard, query, audit, change, migrate, ref, rule, sweep. Classifies intent, loads ref, executes.
