TheOmenDen.StreamPulse.Scripting.Attributes.OnKeywordMatchAttributeMarks a method as a handler for a chat message that matches a keyword or regular expression. The method
must accept (IScriptContext, KeywordMatchContext); the context carries the matched text and the
originating message. A compiled graph bakes the authored pattern + match mode (keyword/regex) as the
guard, so each handler responds only to its own pattern. Keyword matching runs on the chat firehose, so
graphs of this trigger are dispatched on the high-volume (drop-oldest) lane.