fix: normalize Forgejo 'label_updated' to 'labeled' in context

Forgejo sends eventAction 'label_updated' instead of 'labeled' for
issue label events. Add FORGEJO_EVENT_ACTION_MAP in context.ts to
normalize at parse time (same pattern as event name normalization),
so all downstream code (trigger.ts, create-prompt) works unchanged.

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

src/github/context.ts

@@ -68,10 +68,23 @@ const FORGEJO_EVENT_NAME_MAP: Record<string, string> = {
   pull_request_comment: "pull_request_review_comment",
 };
 
+/**
+ * Forgejo uses different action names for some webhook event actions.
+ * Normalize to GitHub-canonical names so all downstream code works unchanged.
+ */
+const FORGEJO_EVENT_ACTION_MAP: Record<string, string> = {
+  label_updated: "labeled",
+};
+
 function normalizeEventName(eventName: string): string {
   return FORGEJO_EVENT_NAME_MAP[eventName] ?? eventName;
 }
 
+function normalizeEventAction(action: string | undefined): string | undefined {
+  if (!action) return action;
+  return FORGEJO_EVENT_ACTION_MAP[action] ?? action;
+}
+
 const AUTOMATION_EVENT_NAMES = [
   "workflow_dispatch",
   "repository_dispatch",
@@ -149,7 +162,7 @@ export function parseGitHubContext(): GitHubContext {
 
   const commonFields = {
     runId: process.env.GITHUB_RUN_ID!,
-    eventAction: context.payload.action,
+    eventAction: normalizeEventAction(context.payload.action),
     repository: {
       owner: context.repo.owner,
       repo: context.repo.repo,