docs(v2): update for gap-closeout — peer-URI discovery, role overlays, release status

docs/v2/v2-release-readiness.md

@@ -57,7 +57,7 @@ Remaining follow-ups (hardening):
 Remaining Phase 6.3 surfaces (hardening, not release-blocking):
 
 - ~~`PeerHttpProbeLoop` + `PeerUaProbeLoop` HostedServices populating `PeerReachabilityTracker` on each tick.~~ **Closed 2026-04-24.** Two-layer probe model shipped: HTTP probe at 2 s / 1 s timeout against `/healthz`; OPC UA probe at 10 s / 5 s timeout via `DiscoveryClient.GetEndpoints`, short-circuiting when HTTP reports the peer unhealthy. Registered on the Server as `AddHostedService<PeerHttpProbeLoop>` + `AddHostedService<PeerUaProbeLoop>`. Publisher now sees accurate `PeerReachability` per peer instead of degrading to `Unknown` → Isolated-Primary band (230).
-- OPC UA variable-node wiring: bind `ServiceLevel` Byte + `ServerUriArray` String[] to the publisher's events via `BaseDataVariable.OnReadValue` / direct value push.
+- ~~OPC UA variable-node wiring: bind `ServiceLevel` Byte + `ServerUriArray` String[] to the publisher's events via `BaseDataVariable.OnReadValue` / direct value push.~~ **Closed 2026-05-26.** `ServiceLevel` byte binding closed earlier under Path D. Peer-URI half closed via `OpcUaApplicationHost.PopulateServerArray` — populates self + each `PeerApplicationUris` entry into the SDK `IServerInternal.ServerUris` `StringTable`; clients read `Server.ServerArray` (NodeId `i=2254`). Validated by `DualEndpointTests` in `tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.IntegrationTests/`. `ServerUriArray` proper (the redundancy-object-type child) remains deferred pending object-type upgrade.
 - ~~`sp_PublishGeneration` wraps its apply in `await using var lease = coordinator.BeginApplyLease(...)` so the `PrimaryMidApply` band (200) fires during actual publishes (task #148 part 2).~~ **Closed 2026-04-24.** The apply loop now lives in `GenerationRefreshHostedService` — polls `sp_GetCurrentGenerationForCluster` every 5s, opens a lease when a new generation is detected, calls `RedundancyCoordinator.RefreshAsync` inside the `await using`, releases the lease on all exit paths. Replaces the previous "topology never refreshes without a process restart" behaviour.
 - Client interop matrix — Ignition / Kepware / Aveva OI Gateway (Stream F, task #150). Manual + doc-only.
 
@@ -118,6 +118,7 @@ v2 GA requires all of the following:
 
 ## Change log
 
+- **2026-05-26** — Gap-closeout pass. `OpcUaApplicationHost.PopulateServerArray` populates `Server.ServerArray` (NodeId `i=2254`) with self + `OpcUaApplicationHostOptions.PeerApplicationUris`, giving non-transparent peer URI visibility through the standard discovery surface. New `tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.IntegrationTests/` IT project (`DualEndpointTests`) validates with two real `OpcUaApplicationHost` instances on loopback + a live OPCFoundation client `Session` read. CI `v2-ci.yml` `integration:` job converted to a matrix across `Host.IntegrationTests` + `OpcUaServer.IntegrationTests`. Per-role appsettings overlays shipped (`appsettings.admin.json` / `appsettings.driver.json` / `appsettings.admin-driver.json`) — `Program.cs:33-35` loads by alphabetical-joined role suffix. `FailoverScenarioTests` → `FailoverDuringDeployTests` rename. Stale empty `src/Server/{Server,Admin}` + `tests/Server/{Server.Tests,Admin.Tests,Admin.E2ETests}` directories deleted (no source, absent from `.slnx`).
 - **2026-04-24** — Phase 5 driver complement closed (task #120 CLOSED). AB CIP, AB Legacy, TwinCAT, FOCAS all shipped. FOCAS migration: retired the Tier-C split (`Driver.FOCAS.Host` + `Driver.FOCAS.Shared` + `FwlibNative` + shim DLL deleted) in favour of a pure-managed in-process `FocasWireClient` inlined into `Driver.FOCAS`; driver is now read-only against the CNC by design. Integration test matrix grew to cover Browse / Subscribe / IAlarmSource / Probe end-to-end.
 - **2026-04-23** — Phase 6.4 audit close-out. IdentificationFolderBuilder + OPC 40010 Identification folder verified against the shipped code.
 - **2026-04-20** — Phase 7 plan drafted (`phase-7-scripting-and-alarming.md`, `phase-7-e2e-smoke.md`). Out of scope for v2 GA.