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Follow-up to the cold adversarial review of PR #382 (MERGEABLE-WITH-NITS): - Block TZ guard: BaseUtcOffset -> GetUtcOffset(Start). BaseUtcOffset is zero year-round for DST zones like Europe/London, so it would pass in a summer-dated fixture where London != UTC; GetUtcOffset pins the actual build instant and is correct regardless of fixture date. (Safe today — mid-Jan fixture — but removes the latent fixture-date dependency the reviewer flagged.) - Document the determinism invariants the fixture relies on: golden captures raw builder output (pre-trim AddedItems), Classic is TZ-independent for the captured fields (no guard needed), and ResetPlayout's random Seed can't perturb the Chronological fixture (RandomStartPoint/ShuffleScheduleItems false, distinct release dates). Re-verified: TZ=UTC both goldens pass; TZ=America/New_York Block skips, Classic passes; no golden drift. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>