Alex Blank
03d22c4d06
fix: set SSH key ownership to container user with mode 600
- Mount SSH keys as bind (not ro) so docker exec --user root can chown
- Add apply_ssh_permissions() to permission_fixer.py
- Call apply_ssh_permissions() after container start for all instance types
- Derive container user from home_dir (/root → root, /home/user → user)
- Tests: apply_ssh_permissions unit tests + start_instance integration tests
Quality gates: pytest 236 passed (6 pre-existing failures), tsc --noEmit clean