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The March canonical migration froze the transition core and suppression path; the post-March regression record (#1682, #1683, #1553, #1693) shows those layers are where the recurring lifecycle bug classes live. ALERT_ENGINE_EVOLUTION.md extends the migration end-state one layer deeper — additive event log (Phase 0), shadow reducer (Phase 1), family-by-family cutover (Phase 2), declarative rules (Phase 3) — using the same strangler mechanism. Registers the Phase 0 work as coverage gap alert-engine-suppression-observability with its record.