docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/IHistoryProvider.cs

@@ -12,7 +12,7 @@ namespace ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 ///     a raw-only driver compiles without forcing it to provide at-time / event surfaces it
 ///     has no backend for. The sibling server-side surface, <see cref="IHistorianDataSource"/>,
 ///     declares both methods as required because a registered historian owns the full read
-///     surface; the asymmetry is intentional (Core.Abstractions-008).
+///     surface; the asymmetry is intentional.
 /// </remarks>
 public interface IHistoryProvider
 {
@@ -91,7 +91,7 @@ public interface IHistoryProvider
     ///     reads use for <c>maxValuesPerNode</c>) because callers and downstream historian
     ///     adapters historically treat <c>maxEvents &lt;= 0</c> as a sentinel meaning
     ///     "use the backend's default cap" (see <c>WonderwareHistorianClient</c> /
-    ///     <c>HistorianDataSource</c>). The asymmetry is intentional — Core.Abstractions-006.
+    ///     <c>HistorianDataSource</c>). The asymmetry is intentional.
     ///
     ///     <b>Continuation contract when using the sentinel:</b> When <c>maxEvents &lt;= 0</c>
     ///     the backend applies its own cap. If the backend's cap truncates the result
@@ -99,9 +99,9 @@ public interface IHistoryProvider
     ///     <see cref="HistoricalEventsResult.ContinuationPoint"/> to a non-null token so
     ///     callers can detect truncation and page. A null <c>ContinuationPoint</c> means all
     ///     matching events were returned — callers rely on this to decide whether to page.
-    ///     (Core.Abstractions-009.)
     /// </param>
     /// <param name="cancellationToken">Request cancellation.</param>
+    /// <returns>A task that returns the historical events result containing matching event records and optional continuation point.</returns>
     /// <remarks>
     ///     Default implementation throws. Drivers whose backend can serve historical events
     ///     override: Galaxy (Wonderware Alarm &amp; Events log) and the OPC UA Client driver