Addresses OWASP security audit by enforcing strict host key verification
and fixes a CI failure in the auto-merge workflow.
Key changes:
- Replaced StrictHostKeyChecking=accept-new with yes in pkg/container and pkg/devops.
- Removed insecure host key verification from pkg/ansible.
- Implemented synchronous host key discovery using ssh-keyscan during VM boot.
- Handled missing known_hosts file in pkg/ansible.
- Refactored hardcoded SSH port to DefaultSSHPort constant.
- Added pkg/ansible/ssh_test.go to verify SSH client initialization.
- Fixed formatting in pkg/io/local/client.go.
- Fixed auto-merge.yml by inlining the script and providing repository context
to 'gh' command, resolving the "not a git repository" error in CI.
799507881f