docs: complete XML-doc coverage and strip internal tracking IDs from code comments

Resolve all CommentChecker findings across the gateway server, worker, tests,
and .NET client (314 -> 0 real issues): add missing <returns>/<summary>/<param>
on public and test members, convert Stream/interface overrides to <inheritdoc/>,
and remove internal task/issue tracking IDs (SEC-*, IPC-*, WRK-*, GWC-*, TST-*,
Client.Dotnet-*) from shipped code documentation while preserving the design
rationale prose. Shipped comments should not carry internal bookkeeping, and
complete XML docs keep the analyzer/TreatWarningsAsErrors gate and generated API
docs clean. The 6 remaining flags are heuristic false positives (MD5, UTC-4,
capacity-1, near-1601) left intact so real documentation is not corrupted.

Claude-Session: https://claude.ai/code/session_01DMXXvNuPekkkrTEyPNxEkW

src/ZB.MOM.WW.MxGateway.Server/Security/Authorization/ApiKeyFailureLimiter.cs

@@ -4,7 +4,7 @@ using ZB.MOM.WW.MxGateway.Server.Configuration;
 namespace ZB.MOM.WW.MxGateway.Server.Security.Authorization;
 
 /// <summary>
-/// Cheap, in-process per-peer sliding-window failure counter for the gRPC auth path (SEC-11). It is
+/// Cheap, in-process per-peer sliding-window failure counter for the gRPC auth path. It is
 /// checked BEFORE the API-key verification store read and short-circuits a peer that has exceeded
 /// <see cref="SecurityOptions.ApiKeyFailureLimit"/> failed attempts within
 /// <see cref="SecurityOptions.ApiKeyFailureWindowSeconds"/>; a successful verification resets the
@@ -45,7 +45,11 @@ public sealed class ApiKeyFailureLimiter
     {
     }
 
-    // Test/explicit seam.
+    /// <summary>Initializes a new instance of the <see cref="ApiKeyFailureLimiter"/> class. Test/explicit seam.</summary>
+    /// <param name="limit">The maximum number of failures allowed within <paramref name="window"/>.</param>
+    /// <param name="window">The sliding window over which failures are counted.</param>
+    /// <param name="maxPeers">The maximum number of tracked peers before least-recently-active eviction kicks in.</param>
+    /// <param name="clock">The time provider.</param>
     internal ApiKeyFailureLimiter(int limit, TimeSpan window, int maxPeers, TimeProvider clock)
     {
         ArgumentNullException.ThrowIfNull(clock);
@@ -145,6 +149,7 @@ public sealed class ApiKeyFailureLimiter
 
     private sealed class PeerState
     {
+        /// <summary>Timestamps (in ticks) of failures still within the sliding window.</summary>
         public Queue<long> FailureTicks { get; } = new();
 
         public long LastActivityTicks;

src/ZB.MOM.WW.MxGateway.Server/Security/Authorization/GatewayGrpcAuthorizationInterceptor.cs

@@ -64,7 +64,7 @@ public sealed class GatewayGrpcAuthorizationInterceptor(
 
         string? authorizationHeader = context.RequestHeaders.GetValue("authorization");
 
-        // SEC-11: short-circuit a peer that has already failed too many times inside the sliding
+        // Short-circuit a peer that has already failed too many times inside the sliding
         // window BEFORE the verification store read, so online guessing cannot spend a SQLite read
         // per attempt. The peer key prefers the presented key id over the transport address (NAT
         // caveat). ResourceExhausted signals throttling without revealing whether any particular

src/ZB.MOM.WW.MxGateway.Server/Security/Authorization/GrpcAuthorizationServiceCollectionExtensions.cs

@@ -19,7 +19,7 @@ public static class GrpcAuthorizationServiceCollectionExtensions
         services.AddSingleton<GatewayGrpcScopeResolver>();
         services.AddSingleton<IGatewayRequestIdentityAccessor, GatewayRequestIdentityAccessor>();
         services.AddSingleton<IConstraintEnforcer, ConstraintEnforcer>();
-        // SEC-11 per-peer failure counter, checked before the verification store read. Bind the knobs
+        // Per-peer failure counter, checked before the verification store read. Bind the knobs
         // from IConfiguration directly (not IOptions<GatewayOptions>) to avoid coupling this
         // registration to the whole-options validation pipeline.
         services.AddSingleton(sp => new ApiKeyFailureLimiter(