chore: move pm2-self-heal.sh into scripts/

All companion scripts now live under scripts/ for a single, discoverable location.

scripts/pm2-self-heal.sh

@@ -15,10 +15,11 @@ send_alert() {
     local body="$2"
     curl -s -X POST "$ZULIP_SITE/api/v1/messages" \
         -u "$ZULIP_BOT:$ZULIP_KEY" \
-        -d "type=private" \
-        -d "to=[$OWNER_ID]" \
+        -d "type=stream" \
+        -d "to=agent-hub" \
+        -d "subject=alerts-pm2" \
         -d "content=$subject\n$body" > /dev/null 2>&1
-    echo "[$(date '+%Y-%m-%d %H:%M:%S')] Alert sent" >> "$LOG"
+    echo "[$(date '+%Y-%m-%d %H:%M:%S')] Alert sent to #agent-hub > alerts-pm2" >> "$LOG"
 }
 
 # Log-only mode: replaced by prose contract pm2-self-heal.prose.md