Two fixes for multi-deployment:
1. _pod_has_pvcs now excludes ConfigMap volumes from PVC detection.
Pods with only ConfigMap volumes (like maintenance) correctly get
RollingUpdate strategy instead of Recreate.
2. call_stack_deploy_start catches SystemExit when stack path doesn't
resolve from cwd (common during restart). Most stacks don't have
deploy hooks, so this is non-fatal.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>