Trim sandbox block in 12 news workflows to keepalive-interval only

Agent-Logs-Url: https://github.com/Hack23/riksdagsmonitor/sessions/c0498696-82e9-4a12-a9a3-168a5a90b29e

Co-authored-by: pethers <1726836+pethers@users.noreply.github.com>

Author: Copilot

.github/workflows/news-article-generator.lock.yml

@@ -59,9 +59,7 @@ features:
   mcp-gateway: true
 
 sandbox:
-  agent: awf
   mcp:
-    port: 8080
     keepalive-interval: 300 # 5m ping to keep MCP connections alive; Copilot API token expires ~60min so PR must be created within 25min of agent start
 
 runtimes: