Install/uninstall: only remove the containers and images lager owns

[danielrmerskine]

Summary

lager install (via setup_and_deploy_box.sh) stopped and force-removed every container on the box (docker rm -f $(docker ps -aq)) and pruned every unused image (docker image prune -af); lager uninstall's image cleanup ran the same blanket prune. On a box that also runs third-party containers — a management agent, a user's own databases — this destroys infrastructure the tooling cannot restore. The uninstall prune has previously deleted a user's own images in the field; the box-lifecycle CI's first supervised reinstall (#144) reproduced the class directly by taking down the box's own management agent mid-run.

Changes

• cli/deployment/scripts/setup_and_deploy_box.sh: container cleanup is scoped to what the deployment owns — lager, pigpio, and the legacy controller — instead of everything on the machine; the image prune drops -a (dangling layers only).
• cli/commands/utility/uninstall.py: the blanket docker image prune -af becomes docker rmi -f lager + a dangling-only prune, and the "will be REMOVED" summary now states the true scope.

The principle in both: never remove a container or image this tooling did not create. No knowledge of what else runs on the box is needed or assumed.

Testing

• bash -n on the modified deploy script.
• Full root + cli unit suites green in a clean python:3.11 container (717 tests; test_uninstall_spec pins the removal-step spec and passes unchanged).
• On-box validation rides the box-lifecycle workflow (CI: full box-lifecycle regression on the bench; sign the runner in to the box access gateway #144), whose reinstall phase executes this exact path against a box running a third-party agent — its post-install health checks are the end-to-end proof.

Checklist

• Code follows the project's style guidelines
• Copyright headers are present on new files — n/a (no new files)
• CHANGELOG.md updated
• Documentation updated (if applicable) — n/a

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.