docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

src/ZB.MOM.WW.MxGateway.Worker/MxAccess/MxAccessValueCache.cs

@@ -60,6 +60,7 @@ public sealed class MxAccessValueCache
     /// <param name="serverHandle">MXAccess server handle.</param>
     /// <param name="itemHandle">MXAccess item handle.</param>
     /// <param name="value">The cached value if found.</param>
+    /// <returns><see langword="true"/> if a cached value exists for the handle pair; otherwise <see langword="false"/>.</returns>
     public bool TryGet(
         int serverHandle,
         int itemHandle,
@@ -102,6 +103,7 @@ public sealed class MxAccessValueCache
     /// <param name="pumpStep">Action that pumps any pending Windows messages.</param>
     /// <param name="value">The cached value if the update was received before the deadline.</param>
     /// <param name="pollIntervalMs">How long to sleep between pump cycles. Default 5 ms.</param>
+    /// <returns><see langword="true"/> if an update newer than <paramref name="sinceVersion"/> arrived before the deadline; otherwise <see langword="false"/>.</returns>
     public bool TryWaitForUpdate(
         int serverHandle,
         int itemHandle,
@@ -137,6 +139,7 @@ public sealed class MxAccessValueCache
     /// <summary>Returns the current version for a handle pair, or 0 if no entry exists.</summary>
     /// <param name="serverHandle">MXAccess server handle.</param>
     /// <param name="itemHandle">MXAccess item handle.</param>
+    /// <returns>The current cache entry version, or 0 if no entry exists.</returns>
     public ulong CurrentVersion(
         int serverHandle,
         int itemHandle)