Add plan_cid to run status, change Output Hash to Output

- Display plan CID in run status when available
- Simplified "Output Hash:" label to "Output:"

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

artdag.py

@@ -576,7 +576,10 @@ def status(run_id, plan, artifacts, analysis):
         click.echo(f"Completed: {run['completed_at']}")
 
     if run.get("output_cid"):
-        click.echo(f"Output Hash: {run['output_cid']}")
+        click.echo(f"Output: {run['output_cid']}")
+
+    if run.get("plan_cid"):
+        click.echo(f"Plan: {run['plan_cid']}")
 
     if run.get("error"):
         click.echo(f"Error: {run['error']}")