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>

src/ZB.MOM.WW.OtOpcUa.Core/Hosting/DriverHost.cs

@@ -0,0 +1,80 @@
+using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
+
+namespace ZB.MOM.WW.OtOpcUa.Core.Hosting;
+
+/// <summary>
+///     Process-local registry + lifecycle manager for loaded <see cref="IDriver"/> instances
+///     (decision #65). Phase 1 scaffold — per-process isolation for Tier C drivers (Galaxy, FOCAS)
+///     is implemented in Phase 2 via named-pipe RPC; this class handles in-process drivers today
+///     and exposes the same registration interface so the Tier C wrapper can slot in later.
+/// </summary>
+public sealed class DriverHost : IAsyncDisposable
+{
+    private readonly Dictionary<string, IDriver> _drivers = new();
+    private readonly object _lock = new();
+
+    public IReadOnlyCollection<string> RegisteredDriverIds
+    {
+        get { lock (_lock) return [.. _drivers.Keys]; }
+    }
+
+    public DriverHealth? GetHealth(string driverInstanceId)
+    {
+        lock (_lock)
+            return _drivers.TryGetValue(driverInstanceId, out var d) ? d.GetHealth() : null;
+    }
+
+    /// <summary>
+    ///     Registers the driver and calls <see cref="IDriver.InitializeAsync"/>. If initialization
+    ///     throws, the driver is kept in the registry so the operator can retry; quality on its
+    ///     nodes will reflect <see cref="DriverState.Faulted"/> until <c>Reinitialize</c> succeeds.
+    /// </summary>
+    public async Task RegisterAsync(IDriver driver, string driverConfigJson, CancellationToken ct)
+    {
+        ArgumentNullException.ThrowIfNull(driver);
+        var id = driver.DriverInstanceId;
+
+        lock (_lock)
+        {
+            if (_drivers.ContainsKey(id))
+                throw new InvalidOperationException($"Driver '{id}' is already registered.");
+            _drivers[id] = driver;
+        }
+
+        try { await driver.InitializeAsync(driverConfigJson, ct); }
+        catch
+        {
+            // Keep the driver registered — operator will see Faulted state and can reinitialize.
+            throw;
+        }
+    }
+
+    public async Task UnregisterAsync(string driverInstanceId, CancellationToken ct)
+    {
+        IDriver? driver;
+        lock (_lock)
+        {
+            if (!_drivers.TryGetValue(driverInstanceId, out driver)) return;
+            _drivers.Remove(driverInstanceId);
+        }
+
+        try { await driver.ShutdownAsync(ct); }
+        catch { /* shutdown is best-effort; logs elsewhere */ }
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        List<IDriver> snapshot;
+        lock (_lock)
+        {
+            snapshot = [.. _drivers.Values];
+            _drivers.Clear();
+        }
+
+        foreach (var driver in snapshot)
+        {
+            try { await driver.ShutdownAsync(CancellationToken.None); } catch { /* ignore */ }
+            (driver as IDisposable)?.Dispose();
+        }
+    }
+}