fix: allow Forgejo bot actor on non-comment events

The self-trigger guard blocked the claude bot on all events. Loop risk
only exists for comment/review events (tag mode). PR, workflow_dispatch,
and schedule events are safe — refined the guard to only block on
issue_comment, issues, pull_request_review, and
pull_request_review_comment events.

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

test/actor.test.ts

@@ -205,5 +205,41 @@ describe("checkHumanActor", () => {
         "Blocking self-trigger on Forgejo",
       );
     });
+
+    test("should allow bot actor on pull_request events (no loop risk)", async () => {
+      const mockOctokit = createMockOctokit("User");
+      const context = createMockContext();
+      context.actor = "claude";
+      context.inputs.botName = "claude[bot]";
+      (context as { eventName: string }).eventName = "pull_request";
+
+      await expect(
+        checkHumanActor(mockOctokit, context),
+      ).resolves.toBeUndefined();
+    });
+
+    test("should allow bot actor on workflow_dispatch events (no loop risk)", async () => {
+      const mockOctokit = createMockOctokit("User");
+      const context = createMockContext();
+      context.actor = "claude";
+      context.inputs.botName = "claude[bot]";
+      (context as { eventName: string }).eventName = "workflow_dispatch";
+
+      await expect(
+        checkHumanActor(mockOctokit, context),
+      ).resolves.toBeUndefined();
+    });
+
+    test("should block bot actor on issue_comment events (loop risk)", async () => {
+      const mockOctokit = createMockOctokit("User");
+      const context = createMockContext();
+      context.actor = "claude";
+      context.inputs.botName = "claude[bot]";
+      // eventName defaults to "issue_comment" from createMockContext
+
+      await expect(checkHumanActor(mockOctokit, context)).rejects.toThrow(
+        "Blocking self-trigger on Forgejo",
+      );
+    });
   });
 });