Improve docs coverage and refresh profiling parser artifacts

Add domain-specific XML documentation across src server components to satisfy CommentChecker, and update dotTrace parsing outputs used for diagnostics.

src/NATS.Server/JetStream/Cluster/MetaSnapshotCodec.cs

@@ -25,6 +25,7 @@ internal static class MetaSnapshotCodec
     /// Encodes <paramref name="assignments"/> into the versioned, S2-compressed binary format.
     /// Go reference: jetstream_cluster.go:2075 encodeMetaSnapshot.
     /// </summary>
+    /// <param name="assignments">Current stream placement assignments to persist into the meta snapshot.</param>
     public static byte[] Encode(Dictionary<string, StreamAssignment> assignments)
     {
         var json = JsonSerializer.SerializeToUtf8Bytes(assignments, SerializerOptions);
@@ -40,6 +41,7 @@ internal static class MetaSnapshotCodec
     /// Decodes a versioned, S2-compressed binary snapshot into a stream assignment map.
     /// Go reference: jetstream_cluster.go:2100 decodeMetaSnapshot.
     /// </summary>
+    /// <param name="data">Versioned binary snapshot payload received from replicated state.</param>
     /// <exception cref="InvalidOperationException">
     /// Thrown when <paramref name="data"/> is too short or contains an unrecognised version.
     /// </exception>