Sister to SiteAuditTelemetryActor: takes a combined CachedCallTelemetry
packet and fans it out to the two site-local stores.
* AuditEvent half writes through IAuditWriter (the M2 FallbackAuditWriter
+ SqliteAuditWriter chain — same site SQLite hot-path as sync calls).
* SiteCallOperational half maps Audit.Kind to the matching
IOperationTrackingStore method:
- CachedSubmit -> RecordEnqueueAsync (insert-if-not-exists)
- ApiCallCached / DbWriteCached -> RecordAttemptAsync (monotonic)
- CachedResolve -> RecordTerminalAsync (first-write-wins)
Best-effort contract (alog.md §7): independent try/catch per half so a
thrown writer cannot starve the tracking row (and vice-versa); both
failures are logged at warning level and swallowed — the calling script
never sees them.
Wire push deferred to M6 — the NoOp ISiteStreamAuditClient binding stays
in effect; the forwarder writes only to the local stores in M3. The
existing SiteAuditTelemetryActor drain loop will sweep the audit rows
once a real gRPC client lands.
Bundle E task E2.
Add the second site→central RPC seam alongside the existing M2
IngestAuditEventsAsync. The Bundle D proto already lit up
IngestCachedTelemetry (CachedTelemetryBatch / IngestAck) so this commit
just plumbs the client-side abstraction:
* ISiteStreamAuditClient gains IngestCachedTelemetryAsync(batch, ct).
* NoOpSiteStreamAuditClient implements it returning an empty IngestAck
(same shape as M2 — production gRPC client lands in M6).
* SyncCallEmissionEndToEndTests' DirectActorSiteStreamAuditClient stub
throws NotSupportedException from the new method so a regression that
accidentally routes a cached packet through the sync stub fails loudly.
* New NoOpSiteStreamAuditClientTests cover the null-guard + empty-ack
contract for both batch shapes.
Bundle E task E1.
