FlatteningPipeline loaded data connections but never passed the alarm-capable
connection set to SemanticValidator, so the native-alarm-source capability check
(built but inert) never ran — a source bound to a non-alarm-capable connection
deployed silently. Compute the capable set (IAlarmSubscribableConnection: OPC UA
+ MxGateway) and thread it through ValidationService to SemanticValidator.
Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.
Joseph Doherty