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.Communication/Grpc/SiteStreamGrpcServer.cs

@@ -561,7 +561,7 @@ public class SiteStreamGrpcServer : SiteStreamService.SiteStreamServiceBase
             ? DateTime.SpecifyKind(request.SinceUtc.ToDateTime(), DateTimeKind.Utc)
             : DateTime.MinValue;
 
-        // Composite-keyset cursor (Task 15): proto3 defaults an unset string to
+        // Composite-keyset cursor: proto3 defaults an unset string to
         // "", which the store treats as "no cursor" (legacy inclusive >= behaviour)
         // — so an older central that never sets after_id is unaffected.
         var afterId = string.IsNullOrEmpty(request.AfterId) ? null : request.AfterId;