task-galaxy-e2e branch — non-FOCAS work-in-progress snapshot

Catch-all commit for pending work on the task-galaxy-e2e branch that
wasn't part of the FOCAS migration. Grouping by topic so future per-topic
commits can be cherry-picked if needed.

TwinCAT
- src/.../Driver.TwinCAT/AdsTwinCATClient.cs + TwinCATDriverFactoryExtensions.cs:
  factory-registration extensions + ADS client refinements.
- src/.../Driver.TwinCAT.Cli/Commands/BrowseCommand.cs: new browse command
  for the TwinCAT test-client CLI.
- tests/.../Driver.TwinCAT.IntegrationTests/TwinCAT3SmokeTests.cs + TwinCatProject/:
  fixture scaffold with a minimal POU + README pointing at the TCBSD/ESXi
  VM for e2e.
- docs/Driver.TwinCAT.Cli.md + docs/drivers/TwinCAT-Test-Fixture.md:
  documentation for the above.
- docs/v3/twincat-backlog.md: forward-looking backlog seed.

Admin UI + fleet status
- src/.../Admin/Components/Pages/Clusters/DriversTab.razor + Hosts.razor:
  UI refresh for fleet-status rendering.
- src/.../Admin/Hubs/FleetStatusHub.cs + FleetStatusPoller.cs +
  Admin/Program.cs: SignalR hub + poller plumbing for live fleet data.
- tests/.../Admin.Tests/FleetStatusPollerTests.cs: poller coverage.

Server + redundancy runtime (Phase 6.3 follow-ups)
- src/.../Server/Hosting/RedundancyPublisherHostedService.cs: HostedService
  that owns the RedundancyStatePublisher lifecycle + wires peer reachability.
- src/.../Server/Redundancy/ServerRedundancyNodeWriter.cs: OPC UA
  variable-node writer binding ServiceLevel + ServerUriArray to the
  publisher's events.
- src/.../Server/Program.cs + Server.csproj: hosted-service registration.
- tests/.../Server.Tests/ServerRedundancyNodeWriterTests.cs +
  Server.Tests.csproj: coverage for the above.

Configuration
- src/.../Configuration/Validation/DraftValidator.cs +
  tests/.../Configuration.Tests/DraftValidatorTests.cs: draft-validation
  refinements.

E2E scripts (shared infrastructure)
- scripts/e2e/README.md + _common.ps1 + test-all.ps1: shared helpers + the
  all-drivers test-all runner.
- scripts/e2e/test-opcuaclient.ps1: OPC UA Client e2e runner.

Docs
- docs/v2/implementation/phase-6-{1,2,3,4}*.md + exit-gate-phase-{3,7}.md:
  phase-gate + implementation doc updates.
- docs/v2/plan.md: top-level plan refresh.
- docs/v2/redundancy-interop-playbook.md: client interop playbook for the
  Phase 6.3 redundancy-runtime work.

Two orphan FOCAS docs remain on disk but deliberately unstaged —
docs/v2/focas-deployment.md and docs/v2/implementation/focas-simulator-plan.md
describe the now-retired Tier-C topology and should either be rewritten
or deleted in a follow-up.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/v2/implementation/exit-gate-phase-7.md

@@ -1,6 +1,6 @@
 # Phase 7 Exit Gate — Scripting, Virtual Tags, Scripted Alarms, Historian Sink
 
-> **Status**: Open. Closed when every compliance check passes + every deferred item either ships or is filed as a post-v2-release follow-up.
+> **Status**: **FULLY CLOSED** 2026-04-23 audit — the three original follow-ups (#239 / #240 / #241) were all shipped under later branches but this exit-gate doc wasn't updated at the time. All three verified against the repo + tests green.
 >
 > **Compliance script**: `scripts/compliance/phase-7-compliance.ps1`
 > **Plan doc**: `docs/v2/implementation/phase-7-scripting-and-alarming.md`
@@ -45,13 +45,13 @@ Covered by `scripts/compliance/phase-7-compliance.ps1`:
 - [x] Walker emits `NodeSourceKind.Virtual` + `NodeSourceKind.ScriptedAlarm` variables
 - [x] `DriverNodeManager` dispatch routes Reads by source; Writes to non-Driver rejected with `BadUserAccessDenied` (plan #6)
 
-## Deferred to Post-Gate Follow-ups
+## Deferred to Post-Gate Follow-ups (all closed as of 2026-04-23 audit)
 
-Kept out of the capstone so the gate can close cleanly while the less-critical wiring lands in targeted PRs:
+Originally kept out of the capstone so the gate could close cleanly. Each landed as a targeted follow-up PR; audit this session verified them against the repo:
 
-- [ ] **SealedBootstrap composition root** (task #239) — instantiate `VirtualTagEngine` + `ScriptedAlarmEngine` + `SqliteStoreAndForwardSink` in `Program.cs`; pass `VirtualTagSource` + `ScriptedAlarmSource` as the new `IReadable` parameters on `DriverNodeManager`. Without this, the engines are dormant in production even though every piece is tested.
-- [ ] **Live OPC UA end-to-end smoke** (task #240) — Client.CLI browse + read a virtual tag computed by Roslyn; Client.CLI acknowledge a scripted alarm via the Part 9 method node; historian-disabled deployment returns `BadNotFound` for virtual nodes rather than silent failure.
-- [ ] **sp_ComputeGenerationDiff extension** (task #241) — emit Script / VirtualTag / ScriptedAlarm sections alongside the existing Namespace/DriverInstance/Equipment/Tag/NodeAcl rows so the Admin DiffViewer shows Phase 7 changes between generations.
+- [x] **SealedBootstrap composition root** (task #239) — **CLOSED**. `src/ZB.MOM.WW.OtOpcUa.Server/Phase7/Phase7Composer.cs` instantiates `VirtualTagEngine` + `ScriptedAlarmEngine` via `Phase7EngineComposer.Compose`, and `SqliteStoreAndForwardSink` in `ResolveHistorianSink` when a registered driver provides `IAlarmHistorianWriter` (today: `GalaxyProxyDriver`). `OpcUaServerService.ExecuteAsync` calls `Phase7Composer.PrepareAsync` then `OpcUaApplicationHost.SetPhase7Sources` **before** `applicationHost.StartAsync` so `OtOpcUaServer` + `DriverNodeManager` capture the `VirtualReadable` / `ScriptedAlarmReadable` at construction. 38 tests green under `tests/ZB.MOM.WW.OtOpcUa.Server.Tests/Phase7/` + `SealedBootstrapIntegrationTests`. The work landed under the label "Phase 7 follow-up #246" and was never re-labelled against #239.
+- [x] **Live OPC UA end-to-end smoke** (task #240) — **CLOSED**. `scripts/e2e/test-phase7-virtualtags.ps1` drives a full Client.CLI read of a driver-sourced input, reads the VirtualTag computed off it, triggers a scripted alarm by writing the trigger value, and subscribes to the alarm condition — all through a running OtOpcUa server. Covered in `scripts/e2e/test-all.ps1` + `scripts/e2e/README.md` matrix.
+- [x] **sp_ComputeGenerationDiff extension** (task #241) — **CLOSED**. Migration `20260420232000_ExtendComputeGenerationDiffWithPhase7.cs` extends the stored proc to emit Script / VirtualTag / ScriptedAlarm sections alongside the existing NodeAcl / Tag / Equipment / DriverInstance / Namespace output. Admin DiffViewer picks them up through its existing section-plugin architecture (Phase 6.4 Stream C).
 
 ## Completion Checklist
 
@@ -66,9 +66,9 @@ Kept out of the capstone so the gate can close cleanly while the less-critical w
 - [x] `phase-7-compliance.ps1` present and passes
 - [x] Full solution `dotnet test` passes (no new failures beyond pre-existing tolerated CLI flake)
 - [x] Exit-gate doc checked in
-- [ ] `SealedBootstrap` composition follow-up filed + tracked
-- [ ] Live end-to-end smoke follow-up filed + tracked
-- [ ] `sp_ComputeGenerationDiff` extension follow-up filed + tracked
+- [x] `SealedBootstrap` composition follow-up shipped (#239 / Phase 7 follow-up #246)
+- [x] Live end-to-end smoke follow-up shipped (#240 — `scripts/e2e/test-phase7-virtualtags.ps1`)
+- [x] `sp_ComputeGenerationDiff` extension follow-up shipped (#241 — migration `ExtendComputeGenerationDiffWithPhase7`)
 
 ## How to run