fix: skip test-action for PRs created by claude bot

When Claude creates a PR (e.g. upstream-sync), the pull_request event
fires with actor=claude. The self-trigger guard in actor.ts blocks
this because actor 'claude' matches bot_name 'claude[bot]', causing
test-action to fail with "Blocking self-trigger" error.

Add `if: github.actor != 'claude'` to the test-agent-mode job.
Claude-created PRs (upstream syncs) don't need the integration test
since they're merge commits, not action code changes.

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

.forgejo/kcl-ci/main.k

@@ -160,6 +160,9 @@ _test_action_workflow = {
         "test-agent-mode" = {
             name = "Test Agent Mode on Forgejo"
             "runs-on" = "grunt"
+            # Skip when the PR was created by the claude bot (e.g. upstream-sync PRs).
+            # The self-trigger guard in actor.ts blocks actor=claude matching bot_name=claude[bot].
+            "if" = "github.actor != 'claude'"
             steps = [
                 checkout_mod.checkout()
                 {