fix(gh-monitor): use system event for Signal notification instead of broken announce delivery

tools/gh-monitor/poll.py

@@ -179,8 +179,10 @@ def dispatch_agent(repo_slug: str, pr: dict, event: dict) -> None:
         f"'Got it, looking into this now.' This must happen first, before any code changes.\n"
         f"3. If the comment requests a code change, implement it on the PR branch, "
         f"commit, and push.\n"
-        f"4. Post a follow-up reply with what you did (or why no change was needed).\n"
-        f"5. Keep replies concise and technical."
+        f"4. Post a follow-up GitHub reply with what you did (or why no change was needed).\n"
+        f"5. Run this exact command when done to notify Andrew on Signal:\n"
+        f"   openclaw system event --text \"[gh-monitor] PR #{number}: <one line summary of what you did>\" --mode now\n"
+        f"6. Keep replies concise and technical."
     )
 
     job_name = f"gh-monitor-pr{number}-{event.get('id', 'evt')}"
@@ -194,8 +196,7 @@ def dispatch_agent(repo_slug: str, pr: dict, event: dict) -> None:
                 "--session", "isolated",
                 "--message", message,
                 "--delete-after-run",
-                "--announce",
-                "--to", "uuid:6f600cd9-3223-4d4b-b783-b944ebf9fb8f",
+                "--no-deliver",
                 "--timeout-seconds", "300",
             ],
             capture_output=True,