Corrección: feat(lifecycle): update and uninstall directory targets via recorded ownership (#354) #358

Source PR: #354
Branch: feat/issue-342-lifecycle
Head reviewed: 12ef26a

Push the fixes to the branch above; do not open a new pull request. Comment on the PR and on this issue when done.

Blocking findings

• Uninstall of a nonexistent target directory exits OK instead of failing closed (internal/cli/doctor.go:458): runDirectoryUninstall returns exitOK with status=not_installed when deps.rootExists is false, while the same function returns exitConflict for an existing directory with zero ownership records. Issue feat: include directory targets in update and uninstall via recorded ownership #342 acceptance criterion: "Running update/uninstall against a directory with no prior Cortex ownership fails closed with an explicit diagnostic." A nonexistent path trivially has no prior Cortex ownership, yet uninstall reports success, unlike update which refuses with not_applied in the equivalent case (covered by TestUpdateDirectoryTargetFailsClosedOnUnknownState). There is also no test for uninstall against a never-installed target.
  • Failure scenario: Operator runs cortex uninstall --target-dir /home/user/typo-dir where the path does not exist. The command exits 0 reporting not_installed, so an automation script treats the target as cleanly uninstalled; the same command against an existing empty directory exits with conflict. The acceptance criterion requires fail-closed with an explicit diagnostic in both cases.

Acceptance criteria

• Fixed: Uninstall of a nonexistent target directory exits OK instead of failing closed (internal/cli/doctor.go:458). The scenario below no longer reproduces: Operator runs cortex uninstall --target-dir /home/user/typo-dir where the path does not exist. The command exits 0 reporting not_installed, so an automation script treats the target as cleanly uninstalled; the same command against an existing empty directory exits with conflict. The acceptance criterion requires fail-closed with an explicit diagnostic in both cases.