test(install): exercise zfssnapshot wrapper in VM verification

The wrapper had no runtime coverage — bats tests pin pure helpers and arg parsing only, and verify_rollback bypassed it by calling zfs snapshot / zfs rollback directly via SSH. A regression in cmd_create, cmd_rollback, or cmd_delete would only have surfaced in production.

verify_zfssnapshot_wrapper runs after verify_rollback for ZFS configs (no-op for Btrfs) and exercises:
- list confirms @genesis baseline
- create runtime-test — recursive snapshot across all datasets
- echo no | delete --name — confirms the gate aborts (catches the -n vs = regression class)
- echo yes | delete --name — destroys across all datasets, list confirms gone
- create wrapper-rollback + drop sentinel + rollback --name — round-trip restores the sentinel

The function scps the working-tree wrapper to the VM before testing so the run reflects current source rather than what the ISO froze at build time. A regression here fails the test (no warn-only path) — it's the wrapper's only runtime check.

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