ChittyID compliance validation

[chitcommit]

Description\nEnsure all ChittyID generation goes through id.chitty.cc - no local generation.\n\nTasks\n- [ ] Run chittycheck validation\n- [ ] Remove any local ID generation patterns\n- [ ] Verify proxy-only implementation\n- [ ] Test offline behavior (should fail gracefully)\n\nReference\n- ChittyID is sole authority\n- No fallback generation allowed\n- Evidence uses CT- prefix\n