fix(prd-1): handle undefined actor type on Forgejo

Forgejo's user API doesn't return a `type` field (GitHub returns
"User" or "Bot"). The undefined type was incorrectly treated as
non-human, blocking all Forgejo workflows. Now treat undefined/empty
type as human — Forgejo doesn't have GitHub-style bot accounts.

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

src/github/validation/actor.ts

@@ -21,8 +21,10 @@ export async function checkHumanActor(
 
   console.log(`Actor type: ${actorType}`);
 
-  // Check bot permissions if actor is not a User
-  if (actorType !== "User") {
+  // On Forgejo, the user API doesn't return a `type` field (undefined).
+  // Treat undefined/empty type as a human user — Forgejo doesn't have
+  // GitHub-style bot/app accounts.
+  if (actorType && actorType !== "User") {
     const allowedBots = githubContext.inputs.allowedBots;
 
     // Check if all bots are allowed