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.AuditLog/Site/SiteAuditRetentionOptions.cs

@@ -1,7 +1,7 @@
 namespace ZB.MOM.WW.ScadaBridge.AuditLog.Site;
 
 /// <summary>
-/// Configuration for the site-side SQLite retention purge (PLAN-04 Task 2, S1/U2).
+/// Configuration for the site-side SQLite retention purge.
 /// The site audit store is ephemeral (~7-day retention); <see cref="SiteAuditRetentionService"/>
 /// runs <see cref="ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services.ISiteAuditQueue.PurgeExpiredAsync"/>
 /// on a timer using these knobs. Mirrors the resolve/clamp shape of

src/ZB.MOM.WW.ScadaBridge.AuditLog/Site/SiteAuditRetentionService.cs

@@ -7,7 +7,7 @@ namespace ZB.MOM.WW.ScadaBridge.AuditLog.Site;
 
 /// <summary>
 /// Site-side hosted service that runs the SQLite retention purge on a timer
-/// (PLAN-04 Task 3, S1/U2). Each tick calls
+/// (S1/U2). Each tick calls
 /// <see cref="ISiteAuditQueue.PurgeExpiredAsync"/> with a cutoff of
 /// <c>UtcNow - <see cref="SiteAuditRetentionOptions.ResolvedRetentionDays"/></c>,
 /// deleting Forwarded/Reconciled rows past the retention window and reclaiming the