docs+test(r2-02): bulkhead doc sweep + parsed-knob-must-be-wired guard (01/U-6, OVERALL theme 1)

src/Core/ZB.MOM.WW.OtOpcUa.Configuration/Entities/DriverInstance.cs

@@ -35,8 +35,6 @@ public sealed class DriverInstance
     ///     Null = use the driver's tier defaults. When populated, expected shape:
     ///     <code>
     ///     {
-    ///       "bulkheadMaxConcurrent": 16,
-    ///       "bulkheadMaxQueue": 64,
     ///       "capabilityPolicies": {
     ///         "Read":  { "timeoutSeconds": 5, "retryCount": 5, "breakerFailureThreshold": 3 },
     ///         "Write": { "timeoutSeconds": 5, "retryCount": 0, "breakerFailureThreshold": 5 }

src/Core/ZB.MOM.WW.OtOpcUa.Configuration/Entities/DriverInstanceResilienceStatus.cs

@@ -26,7 +26,9 @@ public sealed class DriverInstanceResilienceStatus
     /// <summary>Rolling count of consecutive Polly pipeline failures for this (instance, host).</summary>
     public int ConsecutiveFailures { get; set; }
 
-    /// <summary>Current Polly bulkhead depth (in-flight calls) for this (instance, host).</summary>
+    /// <summary>In-flight capability-call depth for this (instance, host). Formerly fed a Polly
+    /// concurrency-limiter strategy that was removed (R2-02/01/U-6); the column name is retained to avoid a
+    /// migration on a reader-less entity — it now carries the tracker's in-flight-call count.</summary>
     public int CurrentBulkheadDepth { get; set; }
 
     /// <summary>Most recent process recycle time (Tier C only; null for in-process tiers).</summary>