fix: accept Forgejo 'label_updated' action for label triggers

Forgejo sends eventAction 'label_updated' instead of 'labeled'
for issue label events (discovered via debug logging, run 52786).
Accept both values in trigger.ts label check.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/github/validation/trigger.ts

@@ -36,7 +36,12 @@ export function checkContainsTrigger(context: ParsedGitHubContext): boolean {
   }
 
   // Check for label trigger
-  if (isIssuesEvent(context) && context.eventAction === "labeled") {
+  // Forgejo sends "label_updated" instead of "labeled" for issue label events
+  if (
+    isIssuesEvent(context) &&
+    (context.eventAction === "labeled" ||
+      context.eventAction === "label_updated")
+  ) {
     const labelName = (context.payload as any).label?.name || "";
 
     if (labelTrigger && labelName === labelTrigger) {