docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

src/ZB.MOM.WW.MxGateway.Server/Dashboard/DashboardSessionAdminService.cs

@@ -93,10 +93,6 @@ public sealed class DashboardSessionAdminService(
         }
         catch (Exception exception)
         {
-            // Server-050: any non-SessionManagerException (e.g. an IOException or
-            // InvalidOperationException from the session DisposeAsync / pipe teardown
-            // path) used to propagate raw into Blazor's error boundary. Convert it to
-            // a friendly failure so the Razor pages see only DashboardSessionAdminResult.
             _logger.LogWarning(
                 exception,
                 "Dashboard admin {Actor} close failed unexpectedly for session {SessionId}.",
@@ -162,12 +158,6 @@ public sealed class DashboardSessionAdminService(
         }
         catch (Exception exception)
         {
-            // Server-050: any non-SessionManagerException (e.g. an IOException from
-            // worker pipe teardown surfacing through session.DisposeAsync, or an
-            // InvalidOperationException from a corrupted worker handle) used to
-            // propagate raw into Blazor's error boundary. Convert it to a friendly
-            // failure so the page renders the ResultMessage rather than the circuit
-            // error page.
             _logger.LogWarning(
                 exception,
                 "Dashboard admin {Actor} kill failed unexpectedly for session {SessionId}.",