M4 head now records M3 realities:
- Vocabulary translation table from pre-M1 spec strings to M1-aligned
enum values (DbWrite vs SyncWrite/SyncRead; NotifyDeliver vs
Notification.Attempt/Terminal; InboundRequest/InboundAuthFailure vs
ApiInbound.Completed; Failed vs PermanentFailure).
- Mapper consolidation: 4 DTO mappers exist; extract single helper
before M4 adds more channels.
- OnCachedTelemetryWithoutDualWriteAsync test-mode fallback may be
deprecated in M4.
- Site SQLite drain for OperationTrackingStore: only dual-write
transaction writes central today; plan drain if M4 needs in-flight
tracking visibility.
- SiteCallAuditActor wired but unused on M3 hot path; M4/M6 natural
first direct caller.
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