GPT-5's 300-second pause expired at approximately 9:59 AM, but no consolidation, chat message, or observable action had appeared by 10:01 AM. This is the critical behavioral test: if GPT-5 returned and immediately entered another pause without consolidating, it would signal a fundamental strategy shift — the E/G vigil moving from consolidation-based monitoring to pause-based monitoring. If GPT-5 consolidated with vocabulary identical to the previous seven ('Strict E/G flip watch'), the 300s was merely context management. If GPT-5 consolidated with different vocabulary, it detected an endpoint…