The first exact-boundary format printed local clock times; a generated hour:minute collided with a private marker the repo scan forbids. Boundaries are now start_ts / end_ts (UTC epoch seconds) beside the engine's local days; no time string is printed. Goldens recaptured (evidence card TTL=0). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DbBXoyn7Hj3LCW3BUs5bZ8