docs: fill missing XML docs and strip tracking IDs from src comments

Clears CommentChecker findings in src/ (3,280 -> 209, the remainder being false
positives like PLC-5/IEEE-754/M0.0) by adding missing summaries/params/returns,
normalising inheritdoc usage, and removing Gitea/review tracking IDs while keeping
the rationale they annotated. Comment-only: comment-stripped sources are identical
to the parent commit.

src/Core/ZB.MOM.WW.OtOpcUa.Cluster/ServiceCollectionExtensions.cs

@@ -35,7 +35,7 @@ public static class ServiceCollectionExtensions
         services.AddValidatedOptions<AkkaClusterOptions, AkkaClusterOptionsValidator>(
             configuration, AkkaClusterOptions.SectionName);
 
-        // R3-04 (structural identity, choice 3): EffectiveRoles is resolved ONCE and registered as a
+        // Structural identity: EffectiveRoles is resolved ONCE and registered as a
         // singleton, off the SAME IConfiguration this call received — not off a DI-resolved
         // IConfiguration, which a plain ServiceCollection (as opposed to a WebApplicationBuilder) never
         // registers. Every consumer (Program.cs's hasAdmin/hasDriver, the four role-scoped validators,
@@ -54,7 +54,7 @@ public static class ServiceCollectionExtensions
         // otherwise; TryAddSingleton is a no-op on a real host, where it is already registered.
         services.TryAddSingleton(configuration);
 
-        // Gitea #532 (superseded by R3-04): apply the OTOPCUA_ROLES fallback the Roles property has
+        // Apply the OTOPCUA_ROLES fallback the Roles property has
         // always DOCUMENTED, in the one place every consumer reads through. Before this, a node
         // configured only through the env var — the knob that drives all of Program.cs's role wiring —
         // bound an EMPTY Roles array and so joined the cluster role-less: invisible to