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/IWritable.cs

@@ -5,7 +5,7 @@ namespace ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 ///     historian-only adapter, for example) can omit this.
 /// </summary>
 /// <remarks>
-///     Per <c>docs/v2/plan.md</c> decisions #44 + #45 — <b>writes are NOT auto-retried by default</b>.
+///     Per <c>docs/v2/plan.md</c>, <b>writes are NOT auto-retried by default</b>.
 ///     A timeout may fire after the device already accepted the command; replaying non-idempotent
 ///     field actions (pulses, alarm acks, recipe steps, counter increments) can cause duplicate
 ///     operations. Per-tag opt-in via <c>Tag.WriteIdempotent = true</c> in the central config DB
@@ -19,6 +19,7 @@ public interface IWritable
     /// </summary>
     /// <param name="writes">Pairs of full reference + value to write.</param>
     /// <param name="cancellationToken">Cancellation token; the driver should abort the batch if cancelled.</param>
+    /// <returns>One <see cref="WriteResult"/> per requested write, in the same order.</returns>
     Task<IReadOnlyList<WriteResult>> WriteAsync(
         IReadOnlyList<WriteRequest> writes,
         CancellationToken cancellationToken);