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Closes brain-retro 2026-05-20 #18 — episodes without schema_version=2 (legacy v1 era pre-2026-05-19T08:06) are now visible in STATUS.md metrics. They're already filtered out of factor analysis by analyzer's v1SkippedCount, but their existence was invisible to humans reading STATUS — masking the bootstrap-epoch gap. 2 new vitest tests, 326/326 GREEN. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>