docs(components): accuracy fixes from deep review (batch 1)

Commons (third-party dep, 7 namespaces, retired ApiKey, repo SaveChanges
carve-out), ConfigurationDatabase (5 persisted + 1 non-persisted computed col),
ClusterInfrastructure (abbreviated HOCON note, RemotingPort default),
Host (component matrix: CI/HealthMonitoring/ExternalSystemGateway have no
actors; DeadLetterMonitorActor runs on both roles), Security (Bearer not
X-API-Key; ApiKeyAdmin registered by Host), Communication (Task.Run/Sender).

docs/components/ConfigurationDatabase.md

@@ -61,7 +61,7 @@ Row-level `DELETE` on `AuditLog` is not granted even to the purge role; retentio
 
 Each entity has its own `IEntityTypeConfiguration<T>` in `Configurations/`. Representative examples:
 
-**`AuditLogEntityTypeConfiguration`** maps `AuditLogRow` to `dbo.AuditLog`. The table carries ten writable canonical columns plus six read-only server-side computed columns derived from `DetailsJson` via `JSON_VALUE … PERSISTED`. EF is configured with `ValueGeneratedOnAddOrUpdate()` and no write for the computed columns; the repository writes only the ten canonical columns and lets SQL Server derive the rest:
+**`AuditLogEntityTypeConfiguration`** maps `AuditLogRow` to `dbo.AuditLog`. The table carries ten writable canonical columns plus five persisted computed columns derived from `DetailsJson` via `JSON_VALUE … PERSISTED` (`Kind`, `Status`, `SourceSiteId`, `ExecutionId`, `ParentExecutionId`) and one additional non-persisted computed column `IngestedAtUtc` (SWITCHOFFSET-based; SQL Server forbids PERSISTED on a non-deterministic expression). EF is configured with `ValueGeneratedOnAddOrUpdate()` and no write for the computed columns; the repository writes only the ten canonical columns and lets SQL Server derive the rest:
 
 ```csharp
 // AuditLogEntityTypeConfiguration (excerpt)
@@ -210,7 +210,7 @@ The `SCADABRIDGE_DESIGNTIME_CONNECTIONSTRING` environment variable is an alterna
 
 ## Dependencies & Interactions
 
-- [Commons (#16)](./Commons.md) — all POCO entity classes (`Templates`, `Instances`, `Sites`, `AuditLogEntry`, `SiteCall`, …) and all repository interfaces (`ITemplateEngineRepository`, `IDeploymentManagerRepository`, `ISecurityRepository`, `IInboundApiRepository`, `IExternalSystemRepository`, `INotificationRepository`, `INotificationOutboxRepository`, `ISiteCallAuditRepository`, `IAuditLogRepository`, `ICentralUiRepository`) live there. Commons also declares `IAuditService`, `IAuditCorrelationContext`, `IPartitionMaintenance`, and `IInstanceLocator` — all implemented here.
+- [Commons (#16)](./Commons.md) — all POCO entity classes (`Templates`, `Instances`, `Sites`, `AuditLogEntry`, `SiteCall`, …) and all repository interfaces (`ITemplateEngineRepository`, `IDeploymentManagerRepository`, `ISecurityRepository`, `IInboundApiRepository`, `IExternalSystemRepository`, `INotificationRepository`, `INotificationOutboxRepository`, `ISiteCallAuditRepository`, `IAuditLogRepository`, `ICentralUiRepository`, `ISiteRepository`) live there. Commons also declares `IAuditService`, `IAuditCorrelationContext`, `IPartitionMaintenance`, and `IInstanceLocator` — all implemented here.
 - [Audit Log (#23)](./AuditLog.md) — `IAuditLogRepository` (implemented by `AuditLogRepository`) is the sole central write path for `dbo.AuditLog`. `AuditLogIngestActor`, `CentralAuditWriter`, and `SiteAuditReconciliationActor` all resolve it from a fresh per-message DI scope; the Audit Log component hosts the `AuditLogPartitionMaintenanceService` and `AuditLogPurgeActor` that drive the `IPartitionMaintenance` implementation registered here.
 - [Template Engine (#1)](./TemplateEngine.md) — consumes `ITemplateEngineRepository` for all template, attribute, alarm, native alarm source, script, composition, instance, override, connection binding, and area operations.
 - [Deployment Manager (#2)](./DeploymentManager.md) — consumes `IDeploymentManagerRepository` for deployment records and configuration snapshots.