docs+code: close Theme 1 — 24 design-doc / XML-doc drift findings

Doc/XML-comment drift + small adherence fixes across 17 modules. Highlights:
- Host-017: site CoordinatedShutdown ordering — SiteStreamGrpcServer gains
  CancelAllStreams() (refuse new streams, cancel active), wired into
  Program.cs site branch via ApplicationStopping.
- InboundAPI-021: ParentExecutionId now travels on RouteToGet/SetAttributes
  symmetric with RouteToCallRequest; RouteHelper stamps from _parentExecutionId.
- ClusterInfra-012: ClusterOptionsValidator now requires both seed nodes.
- Comm-018: SiteCommunicationActor.HeartbeatMessage.IsActive derived from
  cluster leader check (was hardcoded true).
- DM-020: reconciliation audit row attributes the current user, not prior deployer.
- SEL-019: EventLogPurgeService early-exits on standby via active-node check.
- Plus comment/XML-doc accuracy fixes across AuditLog, ConfigurationDatabase,
  NotificationOutbox, SiteRuntime, SiteCallAudit; doc refreshes for Component-
  Commons / -ManagementService / -CLI / -ExternalSystemGateway / -HealthMonitoring
  / -Transport / -ConfigurationDatabase; CD-023 index-name doc alignment.

11 new regression tests (RouteHelper x4, SiteStreamGrpcServer x2,
ClusterOptionsValidator x1, SiteCommunicationActor x1, DeploymentService x1,
EventLogPurgeService x3). Build clean (0 warnings); InboundAPI/Communication/
Host suites all green. README regenerated: 112 open (was 136).

code-reviews/ConfigurationDatabase/findings.md

@@ -8,7 +8,7 @@
 | Last reviewed | 2026-05-28 |
 | Reviewer | claude-agent |
 | Commit reviewed | `1eb6e97` |
-| Open findings | 10 |
+| Open findings | 8 |
 
 ## Summary
 
@@ -1212,7 +1212,7 @@ boundary lookup resolves to the expected partition.
 |--|--|
 | Severity | Low |
 | Category | Documentation & comments |
-| Status | Open |
+| Status | Resolved |
 | Location | `src/ScadaLink.ConfigurationDatabase/Repositories/DeploymentManagerRepository.cs:8-14` |
 
 **Description**
@@ -1236,13 +1236,21 @@ snapshots, and the Restrict-FK-aware `DeleteInstanceAsync` for the
 deployment pipeline. Cross-reference the optimistic-concurrency contract on
 `DeploymentRecord.RowVersion`.
 
+**Resolution (2026-05-28):**
+
+Replaced the stale "WP-24: Stub level sufficient for diff/staleness support" XML
+doc with an accurate one-paragraph summary covering `DeploymentRecord` CRUD
+(plus the `RowVersion` optimistic-concurrency contract), `SystemArtifactDeploymentRecord`
+CRUD, `DeployedConfigSnapshot` CRUD, and the Restrict-FK-aware `DeleteInstanceAsync`.
+No behaviour change.
+
 ### ConfigurationDatabase-023 — `AuditLog` correlation-index name drifts from design doc (`IX_AuditLog_CorrelationId` vs `IX_AuditLog_Correlation`)
 
 | | |
 |--|--|
 | Severity | Low |
 | Category | Design-document adherence |
-| Status | Open |
+| Status | Resolved |
 | Location | `src/ScadaLink.ConfigurationDatabase/Configurations/AuditLogEntityTypeConfiguration.cs:99-101`, `Migrations/20260520142214_AddAuditLogTable.cs:103-107` |
 
 **Description**
@@ -1268,6 +1276,14 @@ preserves the existing migration; renaming the index in the database requires a
 migration that does `sp_rename`. Document-aligning is the lower-cost option and
 matches the resolution pattern used for CD-005.
 
+**Resolution (2026-05-28):**
+
+Doc-aligns-to-code, preserving the existing migration. `docs/requirements/Component-AuditLog.md`
+already lists the index as `IX_AuditLog_CorrelationId` (line 109). The stale
+`IX_AuditLog_Correlation` reference in `docs/requirements/Component-ConfigurationDatabase.md`
+line 64 (AuditLog table prose) was updated to `IX_AuditLog_CorrelationId`. Code unchanged;
+index name remains `IX_AuditLog_CorrelationId`.
+
 ### ConfigurationDatabase-024 — Missing test coverage for SPLIT-RANGE failure-continuation and production-shape rowversion delete
 
 | | |