Phase 6.1 Stream E (data layer) — DriverInstanceResilienceStatus entity + DriverResilienceStatusTracker + EF migration

Ships the data + runtime layer of Stream E. The SignalR hub and Blazor /hosts
page refresh (E.2-E.3) are follow-up work paired with the visual-compliance
review per Phase 6.4 patterns — documented as a deferred follow-up below.

Configuration:
- New entity DriverInstanceResilienceStatus with:
  DriverInstanceId, HostName (composite PK),
  LastCircuitBreakerOpenUtc, ConsecutiveFailures, CurrentBulkheadDepth,
  LastRecycleUtc, BaselineFootprintBytes, CurrentFootprintBytes,
  LastSampledUtc.
- Separate from DriverHostStatus (per-host connectivity view) so a Running
  host that has tripped its breaker or is nearing its memory ceiling shows up
  distinctly on Admin /hosts. Admin page left-joins both for display.
- OtOpcUaConfigDbContext + Fluent-API config + IX_DriverResilience_LastSampled
  index for the stale-sample filter query.
- EF migration: 20260419124034_AddDriverInstanceResilienceStatus.

Core.Resilience:
- DriverResilienceStatusTracker — process-singleton in-memory tracker keyed on
  (DriverInstanceId, HostName). CapabilityInvoker + MemoryTracking +
  MemoryRecycle callers record failure/success/breaker-open/recycle/footprint
  events; a HostedService (Stream E.2 follow-up) samples this tracker every
  5 s and persists to the DB. Pure in-memory keeps tests fast + the core
  free of EF/SQL dependencies.

Tests:
- DriverResilienceStatusTrackerTests (9 new, all pass): tryget-before-write
  returns null; failures accumulate; success resets; breaker/recycle/footprint
  fields populate; per-host isolation; snapshot returns all pairs; concurrent
  writes don't lose counts.
- SchemaComplianceTests: expected-tables list updated to include the new
  DriverInstanceResilienceStatus table.

Full solution dotnet test: 1042 passing (baseline 906, +136 for Phase 6.1 so
far across Streams A/B/C/D/E.1). Pre-existing Client.CLI Subscribe flake
unchanged.

Deferred to follow-up PR (E.2/E.3):
- ResilienceStatusPublisher HostedService that samples DriverResilienceStatusTracker
  every 5 s + upserts DriverInstanceResilienceStatus rows.
- Admin FleetStatusHub SignalR hub pushing LastCircuitBreakerOpenUtc /
  CurrentBulkheadDepth / LastRecycleUtc on change.
- Admin /hosts Blazor column additions (red badge when
  ConsecutiveFailures > breakerThreshold / 2). Visual-compliance reviewer
  signoff alongside Phase 6.4 admin-ui patterns.

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

src/ZB.MOM.WW.OtOpcUa.Configuration/Migrations/20260419124034_AddDriverInstanceResilienceStatus.cs

@@ -0,0 +1,46 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ZB.MOM.WW.OtOpcUa.Configuration.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddDriverInstanceResilienceStatus : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "DriverInstanceResilienceStatus",
+                columns: table => new
+                {
+                    DriverInstanceId = table.Column<string>(type: "nvarchar(64)", maxLength: 64, nullable: false),
+                    HostName = table.Column<string>(type: "nvarchar(256)", maxLength: 256, nullable: false),
+                    LastCircuitBreakerOpenUtc = table.Column<DateTime>(type: "datetime2(3)", nullable: true),
+                    ConsecutiveFailures = table.Column<int>(type: "int", nullable: false),
+                    CurrentBulkheadDepth = table.Column<int>(type: "int", nullable: false),
+                    LastRecycleUtc = table.Column<DateTime>(type: "datetime2(3)", nullable: true),
+                    BaselineFootprintBytes = table.Column<long>(type: "bigint", nullable: false),
+                    CurrentFootprintBytes = table.Column<long>(type: "bigint", nullable: false),
+                    LastSampledUtc = table.Column<DateTime>(type: "datetime2(3)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_DriverInstanceResilienceStatus", x => new { x.DriverInstanceId, x.HostName });
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_DriverResilience_LastSampled",
+                table: "DriverInstanceResilienceStatus",
+                column: "LastSampledUtc");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "DriverInstanceResilienceStatus");
+        }
+    }
+}