docs(xml): fill missing XML doc comments + strip task-tracking refs across src (fixdocs)

Add missing <summary>/<param>/<returns>/<typeparam> tags and switch
interface implementations to <inheritdoc/> across 106 files; strip
project bookkeeping identifiers (Task NN, #05-TNN, PLAN-04, StoreAndForward-0NN)
from shipped code comments while preserving the descriptive rationale.
Comment-only: zero code-logic lines changed; solution builds 0/0.

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

src/ZB.MOM.WW.ScadaBridge.Commons/Interfaces/Kpi/IAuditBacklogProvider.cs

@@ -29,5 +29,6 @@ public interface IAuditBacklogProvider
     /// summed across every site's latest health report. Never negative; zero when
     /// no site is reporting a backlog.
     /// </summary>
+    /// <returns>The system-wide pending Audit Log backlog count.</returns>
     long GetPendingBacklogTotal();
 }

src/ZB.MOM.WW.ScadaBridge.Commons/Interfaces/Services/IOperationTrackingStore.cs

@@ -137,7 +137,7 @@ public interface IOperationTrackingStore
     /// the caller advance the cursor monotonically across follow-up pulls.
     /// </para>
     /// <para>
-    /// <b>Composite keyset (Task 15).</b> When <paramref name="afterId"/> is
+    /// <b>Composite keyset.</b> When <paramref name="afterId"/> is
     /// supplied the read uses a <c>(UpdatedAtUtc, TrackedOperationId)</c> keyset:
     /// it returns rows strictly after that cursor — <c>UpdatedAtUtc &gt; sinceUtc</c>,
     /// or <c>UpdatedAtUtc = sinceUtc</c> with a <c>TrackedOperationId</c> greater