docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.

src/ZB.MOM.WW.ScadaBridge.Communication/Grpc/SiteStreamGrpcServer.cs

@@ -301,30 +301,7 @@ public class SiteStreamGrpcServer : SiteStreamService.SiteStreamServiceBase
         }
     }
 
-    /// <summary>
-    /// Audit Log (#23) M2 site→central push RPC. Decodes a site batch into
-    /// <see cref="AuditEvent"/> rows, Asks the central <c>AuditLogIngestActor</c>
-    /// proxy to persist them, and echoes the accepted EventIds back so the site
-    /// can flip its local rows to <c>Forwarded</c>.
-    /// </summary>
-    /// <remarks>
-    /// <para>
-    /// The DTO→entity conversion uses the shared <see cref="AuditEventDtoMapper"/>
-    /// (hosted in <c>ZB.MOM.WW.ScadaBridge.Communication</c> so both this server and
-    /// <c>ZB.MOM.WW.ScadaBridge.AuditLog</c> share one implementation without a
-    /// project-reference cycle).
-    /// </para>
-    /// <para>
-    /// When <see cref="_auditIngestActor"/> is not yet wired (host startup
-    /// race window), the RPC returns an empty <see cref="IngestAck"/> rather
-    /// than failing — the site treats the missing ack as a transient outcome
-    /// and retries on the next drain, which is the desired idempotent
-    /// behaviour.
-    /// </para>
-    /// </remarks>
     /// <inheritdoc />
-    /// <param name="request">The audit event batch to ingest.</param>
-    /// <param name="context">The server call context.</param>
     public override async Task<IngestAck> IngestAuditEvents(
         AuditEventBatch request,
         ServerCallContext context)
@@ -380,22 +357,7 @@ public class SiteStreamGrpcServer : SiteStreamService.SiteStreamServiceBase
         return ack;
     }
 
-    /// <summary>
-    /// Audit Log (#23) M3 site→central combined-telemetry push RPC. Decodes a
-    /// batch of <see cref="CachedTelemetryPacket"/> entries into matched
-    /// (AuditEvent, SiteCall) pairs, Asks the central <c>AuditLogIngestActor</c>
-    /// proxy to persist them in dual-write transactions, and echoes the
-    /// AuditEvent EventIds that committed back so the site can flip its local
-    /// rows to <c>Forwarded</c>.
-    /// </summary>
-    /// <remarks>
-    /// Same wiring-incomplete fallback as <see cref="IngestAuditEvents"/>: when
-    /// the actor proxy has not been set the RPC replies with an empty ack so
-    /// sites treat the outcome as transient and retry, never a hard fault.
-    /// </remarks>
     /// <inheritdoc />
-    /// <param name="request">The cached telemetry batch to ingest.</param>
-    /// <param name="context">The server call context.</param>
     public override async Task<IngestAck> IngestCachedTelemetry(
         CachedTelemetryBatch request,
         ServerCallContext context)
@@ -445,27 +407,7 @@ public class SiteStreamGrpcServer : SiteStreamService.SiteStreamServiceBase
         return ack;
     }
 
-    /// <summary>
-    /// Audit Log (#23) M6 reconciliation pull RPC. Central asks the site for any
-    /// AuditLog rows whose <c>OccurredAtUtc &gt;= since_utc</c> and whose
-    /// <c>ForwardState</c> is still <c>Pending</c> or <c>Forwarded</c> (i.e. not
-    /// yet confirmed reconciled), bounded by <c>batch_size</c>. The site responds
-    /// with the rows AND flips them to
-    /// <see cref="ZB.MOM.WW.ScadaBridge.Commons.Types.Enums.AuditForwardState.Reconciled"/>
-    /// AFTER serializing the response. The flip is best-effort — if it fails
-    /// (e.g. SQLite disposed mid-call), rows stay Pending/Forwarded and central
-    /// pulls them again on the next reconciliation cycle. Idempotent.
-    /// </summary>
-    /// <remarks>
-    /// When <see cref="_siteAuditQueue"/> is not wired (central-only host or a
-    /// composition-root test exercising the server in isolation) the RPC returns
-    /// an empty response — central treats that as "nothing to ship" and retries
-    /// on its next cycle, which is the same self-healing semantics as the
-    /// SetAuditIngestActor wiring race window.
-    /// </remarks>
     /// <inheritdoc />
-    /// <param name="request">The pull request with time bounds and batch size.</param>
-    /// <param name="context">The server call context.</param>
     public override async Task<PullAuditEventsResponse> PullAuditEvents(
         PullAuditEventsRequest request,
         ServerCallContext context)