fix: make smoke-claude safe outputs trigger-aware for workflow_dispatch (#2036)

The smoke-claude prompt unconditionally instructs the agent to add
comments and labels to 'the pull request', but workflow_dispatch and
schedule triggers have no PR context. The add_labels handler hard-fails
(unlike add_comment which skips gracefully), causing the safe_outputs
job to fail on manual runs.

Update the prompt to only emit add_comment/add_labels when triggered
by a pull_request, and use noop for non-PR triggers.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lpcox

.github/aw/actions-lock.json

@@ -45,10 +45,10 @@
       "version": "v4.0.0",
       "sha": "4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd"
     },
-    "github/gh-aw-actions/setup@v0.68.3": {
+    "github/gh-aw-actions/setup@v0.68.4": {
       "repo": "github/gh-aw-actions/setup",
-      "version": "v0.68.3",
-      "sha": "ba90f2186d7ad780ec640f364005fa24e797b360"
+      "version": "v0.68.4",
+      "sha": "57583dfa129051b855aa5d750d36fbeb8a885579"
     },
     "github/gh-aw/actions/setup@v0.68.1": {
       "repo": "github/gh-aw/actions/setup",