feat: check trigger label on issue opened events

When an issue is created with the trigger label already applied,
Forgejo only fires issues/opened (not a separate labeled event).
Check payload.issue.labels for the trigger label during opened
events so creating an issue with the claude label works in one step.

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

src/github/validation/trigger.ts

@@ -45,8 +45,21 @@ export function checkContainsTrigger(context: ParsedGitHubContext): boolean {
     }
   }
 
-  // Check for issue body and title trigger on issue creation
+  // Check for issue body, title, and label trigger on issue creation
   if (isIssuesEvent(context) && context.eventAction === "opened") {
+    // Check if the issue was created with the trigger label already applied
+    if (labelTrigger) {
+      const issueLabels: Array<{ name?: string }> =
+        (context.payload.issue as any).labels ?? [];
+      const hasLabel = issueLabels.some((l) => l.name === labelTrigger);
+      if (hasLabel) {
+        console.log(
+          `Issue opened with trigger label '${labelTrigger}' already applied`,
+        );
+        return true;
+      }
+    }
+
     const issueBody = context.payload.issue.body || "";
     const issueTitle = context.payload.issue.title || "";
     // Check for exact match with word boundaries or punctuation