docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

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

@@ -20,6 +20,12 @@ public interface IHistoryProvider
     ///     Read raw historical samples for a single attribute over a time range.
     ///     The Core wraps this with continuation-point handling.
     /// </summary>
+    /// <param name="fullReference">The full reference path to the attribute.</param>
+    /// <param name="startUtc">Inclusive lower bound on the time range (UTC).</param>
+    /// <param name="endUtc">Exclusive upper bound on the time range (UTC).</param>
+    /// <param name="maxValuesPerNode">Maximum number of values to return per node.</param>
+    /// <param name="cancellationToken">A cancellation token to stop the operation.</param>
+    /// <returns>A task that returns the history read result containing samples and optional continuation point.</returns>
     Task<HistoryReadResult> ReadRawAsync(
         string fullReference,
         DateTime startUtc,
@@ -31,6 +37,13 @@ public interface IHistoryProvider
     ///     Read processed (aggregated) samples — interval-bucketed average / min / max / etc.
     ///     Optional — drivers that only support raw history can throw <see cref="NotSupportedException"/>.
     /// </summary>
+    /// <param name="fullReference">The full reference path to the attribute.</param>
+    /// <param name="startUtc">Inclusive lower bound on the time range (UTC).</param>
+    /// <param name="endUtc">Exclusive upper bound on the time range (UTC).</param>
+    /// <param name="interval">The time interval for bucketing samples.</param>
+    /// <param name="aggregate">The aggregate function to apply to each bucket.</param>
+    /// <param name="cancellationToken">A cancellation token to stop the operation.</param>
+    /// <returns>A task that returns the history read result containing aggregated samples and optional continuation point.</returns>
     Task<HistoryReadResult> ReadProcessedAsync(
         string fullReference,
         DateTime startUtc,
@@ -49,6 +62,10 @@ public interface IHistoryProvider
     ///     <c>IHistoryProvider</c> implementations compiling without forcing a ReadAtTime path
     ///     they may not have a backend for.
     /// </remarks>
+    /// <param name="fullReference">The full reference path to the attribute.</param>
+    /// <param name="timestampsUtc">The list of timestamps at which to read values.</param>
+    /// <param name="cancellationToken">A cancellation token to stop the operation.</param>
+    /// <returns>A task that returns the history read result containing samples at the requested times.</returns>
     Task<HistoryReadResult> ReadAtTimeAsync(
         string fullReference,
         IReadOnlyList<DateTime> timestampsUtc,