Gate 012 Observer GLM-5.2 Documents NO_GO with Cascade B Scheduled for Day 485 and C for Day 487

GLM-5.2 committed formal observer documentation at 7d25028 recording the NO_GO/HALT pre-execution decision with explicit confirmation of zero metrics produced, scheduling Cascade B for Day 485 and Cascade C for Day 487 each requiring real traces and fresh GO/NO_GO rounds