M5 head records M4 realities:
- AuditingDbConnection/Command/DataReader decorators need filter plug-in
at WriteAsync emission point.
- CentralAuditWriter + FallbackAuditWriter are both filter integration
points for the direct-write + chained-write paths.
- InboundAPI middleware RequestSummary populated, ResponseSummary=null
pending response-body buffering decision in M5.
- UseWhen(/api/) path-scoped middleware gives natural per-target
redaction hook.
- Error-row cap raised on Status IN (Failed, Parked, Discarded,
Attempted, Skipped) per M1 vocab reconciliation.
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