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.Worker/Ipc/WorkerFrameProtocolOptions.cs

@@ -12,7 +12,7 @@ public sealed class WorkerFrameProtocolOptions
 
     /// <summary>
     /// Upper ceiling the worker will accept for a gateway-negotiated frame maximum
-    /// (<c>GatewayHello.max_frame_bytes</c>, IPC-02). Matches the gateway's own configuration ceiling
+    /// (<c>GatewayHello.max_frame_bytes</c>). Matches the gateway's own configuration ceiling
     /// so a nonsensical negotiated value is rejected at the handshake rather than driving an absurd
     /// per-frame allocation. 256 MiB.
     /// </summary>
@@ -109,15 +109,15 @@ public sealed class WorkerFrameProtocolOptions
     /// <summary>
     /// Gets the maximum worker-frame message size in bytes. Initialized from the constructor and
     /// then adopted once from the gateway-negotiated value during the startup handshake
-    /// (<c>GatewayHello.max_frame_bytes</c>, IPC-02) via <see cref="AdoptNegotiatedMaxMessageBytes"/>,
+    /// (<c>GatewayHello.max_frame_bytes</c>) via <see cref="AdoptNegotiatedMaxMessageBytes"/>,
     /// before the message loop starts. Not mutated afterwards, so the single-threaded handshake write
     /// is safe for the reader/writer that share this instance.
     /// </summary>
     public int MaxMessageBytes { get; private set; }
 
     /// <summary>
-    /// Adopts the gateway-negotiated frame maximum conveyed in <c>GatewayHello.max_frame_bytes</c>
-    /// (IPC-02). A value of 0 (an older gateway that never set the field) is ignored and the
+    /// Adopts the gateway-negotiated frame maximum conveyed in <c>GatewayHello.max_frame_bytes</c>.
+    /// A value of 0 (an older gateway that never set the field) is ignored and the
     /// constructor default is kept. A value above <see cref="MaxNegotiableFrameBytes"/> is rejected.
     /// </summary>
     /// <param name="negotiatedMaxFrameBytes">The gateway-negotiated maximum, or 0 for "keep default".</param>