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The mid-band advisory label (constituent signals in conflict) was called NEUTRAL, implying "benign middle" — but retrospective data (637 trades) shows it is empirically the worst-ROI regime. Renaming to UNKNOWN makes the semantics explicit for regime-gate consumers. - esof_advisor.py: emits UNKNOWN; LABEL_COLOR keeps NEUTRAL alias for historical CH rows / stale HZ snapshots - esof_gate.py: S6_MULT, IRP_PARAMS, Strategy A mult_map all keyed on UNKNOWN with NEUTRAL alias (values identical → replays unaffected) - prod/docs/ESOF_LABEL_MIGRATION.md: migration note, CH/HZ impact, rollback procedure Plan ref: Task 4 — NEUTRAL→UNKNOWN is load-bearing for the EsoF gate in the orchestrator (0.25× sizing vs 1.0× under old label semantics). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>