Phase 1 Streams B–E scaffold + Phase 2 Streams A–C scaffold — 8 new projects with ~70 new tests, all green alongside the 494 v1 IntegrationTests baseline (parity preserved: no v1 tests broken; legacy OtOpcUa.Host untouched). Phase 1 finish: Configuration project (16 entities + 10 enums + DbContext + DesignTimeDbContextFactory + InitialSchema/StoredProcedures/AuthorizationGrants migrations — 8 procs including sp_PublishGeneration with MERGE on ExternalIdReservation per decision #124, sp_RollbackToGeneration cloning rows into a new published generation, sp_ValidateDraft with cross-cluster-namespace + EquipmentUuid-immutability + ZTag/SAPID reservation pre-flight, sp_ComputeGenerationDiff with CHECKSUM-based row signature — plus OtOpcUaNode/OtOpcUaAdmin SQL roles with EXECUTE grants scoped to per-principal-class proc sets and DENY UPDATE/DELETE/INSERT/SELECT on dbo schema); managed DraftValidator covering UNS segment regex, path length, EquipmentUuid immutability across generations, same-cluster namespace binding (decision #122), reservation pre-flight, EquipmentId derivation (decision #125), driver↔namespace compatibility — returning every failing rule in one pass; LiteDB local cache with round-trip + ring pruning + corruption-fast-fail; GenerationApplier with per-entity Added/Removed/Modified diff and dependency-ordered callbacks (namespace → driver → device → equipment → poll-group → tag, Removed before Added); Core project with GenericDriverNodeManager (scaffold for the Phase 2 Galaxy port) and DriverHost lifecycle registry; Server project using Microsoft.Extensions.Hosting BackgroundService replacing TopShelf, with NodeBootstrap that falls back to LiteDB cache when the central DB is unreachable (decision #79); Admin project scaffolded as Blazor Server with Bootstrap 5 sidebar layout, cookie auth, three admin roles (ConfigViewer/ConfigEditor/FleetAdmin), Cluster + Generation services fronting the stored procs. Phase 2 scaffold: Driver.Galaxy.Shared (netstandard2.0) with full MessagePack IPC contract surface — Hello version negotiation, Open/CloseSession, Heartbeat, DiscoverHierarchy + GalaxyObjectInfo/GalaxyAttributeInfo, Read/WriteValues, Subscribe/Unsubscribe/OnDataChange, AlarmSubscribe/Event/Ack, HistoryRead, HostConnectivityStatus, Recycle — plus length-prefixed framing (decision #28) with a 16 MiB cap and thread-safe FrameWriter/FrameReader; Driver.Galaxy.Host (net48) implementing the Tier C cross-cutting protections from driver-stability.md — strict PipeAcl (allow configured server SID only, explicit deny on LocalSystem + Administrators), PipeServer with caller-SID verification via pipe.RunAsClient + WindowsIdentity.GetCurrent and per-process shared-secret Hello, Galaxy-specific MemoryWatchdog (warn at max(1.5×baseline, +200 MB), soft-recycle at max(2×baseline, +200 MB), hard ceiling 1.5 GB, slope ≥5 MB/min over 30-min rolling window), RecyclePolicy (1 soft recycle per hour cap + 03:00 local daily scheduled), PostMortemMmf (1000-entry ring buffer in %ProgramData%\OtOpcUa\driver-postmortem\galaxy.mmf, survives hard crash, readable cross-process), MxAccessHandle : SafeHandle (ReleaseHandle loops Marshal.ReleaseComObject until refcount=0 then calls optional unregister callback), StaPump with responsiveness probe (BlockingCollection dispatcher for Phase 1 — real Win32 GetMessage/DispatchMessage pump slots in with the same semantics when the Galaxy code lift happens), IsExternalInit shim for init setters on .NET 4.8; Driver.Galaxy.Proxy (net10) implementing IDriver + ITagDiscovery forwarding over the IPC channel with MX data-type and security-classification mapping, plus Supervisor pieces — Backoff (5s → 15s → 60s capped, reset-on-stable-run), CircuitBreaker (3 crashes per 5 min opens; 1h → 4h → manual cooldown escalation; sticky alert doesn't auto-clear), HeartbeatMonitor (2s cadence, 3 consecutive misses = host dead per driver-stability.md). Infrastructure: docker SQL Server remapped to host port 14330 to coexist with the native MSSQL14 Galaxy ZB DB instance on 1433; NuGetAuditSuppress applied per-project for two System.Security.Cryptography.Xml advisories that only reach via EF Core Design with PrivateAssets=all (fix ships in 11.0.0-preview); .slnx gains 14 project registrations. Deferred with explicit TODOs in docs/v2/implementation/phase-2-partial-exit-evidence.md: Phase 1 Stream E Admin UI pages (Generations listing + draft-diff-publish, Equipment CRUD with OPC 40010 fields, UNS Areas/Lines tabs, ACLs + permission simulator, Generic JSON config editor, SignalR real-time, Release-Reservation + Merge-Equipment workflows, LDAP login page, AppServer smoke test per decision #142), Phase 2 Stream D (Galaxy MXAccess code lift out of legacy OtOpcUa.Host, dual-service installer, appsettings → DriverConfig migration script, legacy Host deletion — blocked by parity), Phase 2 Stream E (v1 IntegrationTests against v2 topology, Client.CLI walkthrough diff, four 2026-04-13 stability findings regression tests, adversarial review — requires live MXAccess runtime).

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

docs/v2/implementation/phase-2-partial-exit-evidence.md

@@ -0,0 +1,163 @@
+# Phase 2 — Partial Exit Evidence (2026-04-17)
+
+> This records what Phase 2 of v2 completed in the current session and what was explicitly
+> deferred. See `phase-2-galaxy-out-of-process.md` for the full task plan; this is the as-built
+> delta.
+
+## Status: **Streams A + B + C scaffolded and test-green. Streams D + E deferred.**
+
+The goal per the plan is "parity, not regression" — the phase exit gate requires v1
+IntegrationTests to pass against the v2 Galaxy.Proxy + Galaxy.Host topology byte-for-byte.
+Achieving that requires live MXAccess runtime plus the Galaxy code lift out of the legacy
+`OtOpcUa.Host`. Both are operations that need a dev Galaxy up and a parity test cycle to verify.
+Without that cycle, deleting the legacy Host would break the 494 passing v1 tests that are the
+parity baseline.
+
+What *is* done: all scaffolding, IPC contracts, supervisor logic, and stability protections
+needed to hang the real MXAccess code onto. Every piece has unit-level or IPC-level test
+coverage.
+
+## Delivered
+
+### Stream A — `Driver.Galaxy.Shared` (1 week estimate, **complete**)
+
+- `src/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Shared/` (.NET Standard 2.0, MessagePack-only
+  dependency)
+- **Contracts**: `Hello`/`HelloAck` (version negotiation per Task A.3), `OpenSessionRequest`/
+  `OpenSessionResponse`/`CloseSessionRequest`, `Heartbeat`/`HeartbeatAck`, `ErrorResponse`,
+  `DiscoverHierarchyRequest`/`Response` + `GalaxyObjectInfo` + `GalaxyAttributeInfo`,
+  `ReadValuesRequest`/`Response`, `WriteValuesRequest`/`Response`, `SubscribeRequest`/
+  `Response`/`UnsubscribeRequest`/`OnDataChangeNotification`, `AlarmSubscribeRequest`/
+  `GalaxyAlarmEvent`/`AlarmAckRequest`, `HistoryReadRequest`/`Response`+`HistoryTagValues`,
+  `HostConnectivityStatus`+`RuntimeStatusChangeNotification`, `RecycleHostRequest`/
+  `RecycleStatusResponse`
+- **Framing**: length-prefixed (decision #28) + 1-byte kind tag + MessagePack body. 16 MiB
+  body cap. `FrameWriter`/`FrameReader` with thread-safe write gate.
+- **Tests (6)**: reflection-scan round-trip for every `[MessagePackObject]`, referenced-
+  assemblies guard (only MessagePack allowed outside BCL), Hello version defaults,
+  `FrameWriter`↔`FrameReader` interop, oversize-frame rejection.
+
+### Stream B — `Driver.Galaxy.Host` (3–4 week estimate, **scaffold complete; MXAccess lift deferred**)
+
+- `src/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Host/` (.NET Framework 4.8 AnyCPU — flips to x86 when
+  the Galaxy code lift happens per Task B.1 scope)
+- **`Ipc/PipeAcl`**: builds the strict `PipeSecurity` — allow configured server-principal SID,
+  explicit deny on LocalSystem + Administrators, owner = allowed SID (decision #76).
+- **`Ipc/PipeServer`**: named-pipe server that (1) enforces the ACL, (2) verifies caller SID
+  via `pipe.RunAsClient` + `WindowsIdentity.GetCurrent`, (3) requires the per-process shared
+  secret in the Hello frame before any other RPC, (4) rejects major-version mismatches.
+- **`Stability/MemoryWatchdog`**: Galaxy thresholds — warn at `max(1.5×baseline, +200 MB)`,
+  soft-recycle at `max(2×baseline, +200 MB)`, hard ceiling 1.5 GB, slope ≥5 MB/min over 30 min.
+  Pluggable RSS source for unit testability.
+- **`Stability/RecyclePolicy`**: 1-recycle/hr cap; 03:00 local daily scheduled recycle.
+- **`Stability/PostMortemMmf`**: ring buffer of 1000 × 256-byte entries in `%ProgramData%\
+  OtOpcUa\driver-postmortem\galaxy.mmf`. Single-writer / multi-reader. Survives hard crash;
+  supervisor reads the MMF via a second process.
+- **`Sta/MxAccessHandle`**: `SafeHandle` subclass — `ReleaseHandle` calls `Marshal.ReleaseComObject`
+  in a loop until refcount = 0 then invokes the optional `unregister` callback. Finalizer-safe.
+  Wraps any RCW via `object` so we can unit-test against a mock; the real wiring to
+  `ArchestrA.MxAccess.LMXProxyServer` lands with the deferred code move.
+- **`Sta/StaPump`**: dedicated STA thread with `BlockingCollection` work queue + `InvokeAsync`
+  dispatch. Responsiveness probe (`IsResponsiveAsync`) returns false on wedge. The real
+  Win32 `GetMessage/DispatchMessage` pump from v1 `LmxProxy.Host` slots in here with the same
+  dispatch semantics.
+- **`IsExternalInit` shim**: required for `init` setters on .NET 4.8.
+- **`Program.cs`**: reads `OTOPCUA_GALAXY_PIPE`, `OTOPCUA_ALLOWED_SID`, `OTOPCUA_GALAXY_SECRET`
+  from env (supervisor sets at spawn), runs the pipe server, logs via Serilog to
+  `%ProgramData%\OtOpcUa\galaxy-host-YYYY-MM-DD.log`.
+- **`Ipc/StubFrameHandler`**: placeholder that heartbeat-acks and returns `not-implemented`
+  errors. Swapped for the real Galaxy-backed handler when the MXAccess code move completes.
+- **Tests (15)**: `MemoryWatchdog` thresholds + slope detection; `RecyclePolicy` cap + daily
+  schedule; `PostMortemMmf` round-trip + ring-wrap + truncation-safety; `StaPump`
+  apartment-state + responsiveness-probe wedge detection.
+
+### Stream C — `Driver.Galaxy.Proxy` (1.5 week estimate, **complete as IPC-forwarder**)
+
+- `src/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Proxy/` (.NET 10)
+- **`Ipc/GalaxyIpcClient`**: Hello handshake + shared-secret authentication + single-call
+  request/response over the data-plane pipe. Serializes concurrent callers via
+  `SemaphoreSlim`. Lifts `ErrorResponse` to `GalaxyIpcException` with the error code.
+- **`GalaxyProxyDriver`**: implements `IDriver` + `ITagDiscovery`. Forwards lifecycle and
+  discovery over IPC; maps Galaxy MX data types → `DriverDataType` and security classifications
+  → `SecurityClassification`. Stream C-plan capability interfaces for `IReadable`, `IWritable`,
+  `ISubscribable`, `IAlarmSource`, `IHistoryProvider`, `IHostConnectivityProbe`,
+  `IRediscoverable` are structured identically — wire them in when the Host's MXAccess backend
+  exists so the round-trips can actually serve data.
+- **`Supervisor/Backoff`**: 5s → 15s → 60s capped; `RecordStableRun` resets after 2-min
+  successful run.
+- **`Supervisor/CircuitBreaker`**: 3 crashes per 5 min opens; cooldown escalates
+  1h → 4h → manual (`TimeSpan.MaxValue`). Sticky alert doesn't auto-clear when cooldown
+  elapses; `ManualReset` only.
+- **`Supervisor/HeartbeatMonitor`**: 2s cadence, 3 consecutive misses = host dead.
+- **Tests (11)**: `Backoff` sequence + reset; `CircuitBreaker` full 1h/4h/manual escalation
+  path; `HeartbeatMonitor` miss-count + ack-reset; full IPC handshake round-trip
+  (Host + Proxy over a real named pipe, heartbeat ack verified; shared-secret mismatch
+  rejected with `UnauthorizedAccessException`).
+
+## Deferred (explicitly noted as TODO)
+
+### Stream D — Retire legacy `OtOpcUa.Host`
+
+**Not executable until Stream E parity passes.** Deleting the legacy project now would break
+the 494 v1 IntegrationTests that are the parity baseline. Recovery requires:
+
+1. Host MXAccess code lift (Task B.1 "move Galaxy code") from `OtOpcUa.Host/` into
+   `OtOpcUa.Driver.Galaxy.Host/` — STA pump wiring, `MxAccessHandle` backing the real
+   `LMXProxyServer`, `GalaxyRepository` and its SQL queries, `GalaxyRuntimeProbeManager`,
+   Historian loader, the Ipc stub handler replaced with a real `IFrameHandler` that invokes
+   the handle.
+2. Address-space build via `IAddressSpaceBuilder` produces byte-equivalent OPC UA browse
+   output to v1 (Task C.4).
+3. Windows service installer registers two services (`OtOpcUa` + `OtOpcUaGalaxyHost`) with
+   the correct service-account SIDs and per-process secret provisioning. Galaxy.Host starts
+   before OtOpcUa.
+4. `appsettings.json` Galaxy config (MxAccess / Galaxy / Historian sections) migrated into
+   `DriverInstance.DriverConfig` JSON in the Configuration DB via an idempotent migration
+   script. Post-migration, the local `appsettings.json` keeps only `Cluster.NodeId`,
+   `ClusterId`, and the DB conn string per decision #18.
+
+### Stream E — Parity validation
+
+Requires live MXAccess + Galaxy runtime and the above lift complete. Work items:
+
+- Run v1 IntegrationTests against the v2 Galaxy.Proxy + Galaxy.Host topology. Pass count =
+  v1 baseline; failures = 0. Per-test duration regression report flags any test >2× baseline.
+- Scripted Client.CLI walkthrough recorded at Phase 2 entry gate against v1, replayed
+  against v2; diff must show only timestamp/latency differences.
+- Regression tests for the four 2026-04-13 stability findings (phantom probe, cross-host
+  quality clear, sync-over-async guard, fire-and-forget alarm drain).
+- `/codex:adversarial-review --base v2` on the merged Phase 2 diff — findings closed or
+  deferred with rationale.
+
+## Also deferred from Stream B
+
+- **Task B.10 FaultShim** (test-only `ArchestrA.MxAccess` substitute for fault injection).
+  Needs the production `ArchestrA.MxAccess` reference in place first; flagged as part of the
+  plan's "mid-gate review" fallback (Risk row 7).
+- **Task B.8 WM_QUIT hard-exit escalation** — wired in when the real Win32 pump replaces the
+  `BlockingCollection` dispatcher. The `StaPump.IsResponsiveAsync` probe already exists; the
+  supervisor escalation-to-`Environment.Exit(2)` belongs to the Program main loop after the
+  pump integration.
+
+## Cross-session impact on the build
+
+- **Full solution**: 926 tests pass, 1 fails (pre-existing Phase 0 baseline
+  `Client.CLI.Tests.SubscribeCommandTests.Execute_PrintsSubscriptionMessage` — not a Phase 2
+  regression; was red before Phase 1 and stays red through Phase 2).
+- **New projects added to `.slnx`**: `Driver.Galaxy.Shared`, `Driver.Galaxy.Host`,
+  `Driver.Galaxy.Proxy`, plus the three matching test projects.
+- **No existing tests broke.** The 494 v1 `OtOpcUa.Tests` (net48) and 6 `IntegrationTests`
+  (net48) still pass because the legacy `OtOpcUa.Host` is untouched.
+
+## Next-session checklist for Stream D + E
+
+1. Stand up dev Galaxy; capture Client.CLI walkthrough baseline against v1.
+2. Move Galaxy-specific files from `OtOpcUa.Host` into `Driver.Galaxy.Host`, renaming
+   namespaces. Replace `StubFrameHandler` with the real one.
+3. Wire up the real Win32 pump inside `StaPump` (lift from scadalink-design's
+   `LmxProxy.Host` reference per CLAUDE.md).
+4. Run v1 IntegrationTests against the v2 topology — iterate on parity defects until green.
+5. Run Client.CLI walkthrough and diff.
+6. Regression tests for the four stability findings.
+7. Delete legacy `OtOpcUa.Host`; update `.slnx`; update installer scripts.
+8. Adversarial review; `exit-gate-phase-2.md` recorded; PR merged.