ACTIVITY-WP-0020-T07: the kubectl scan only sees the prune host's own
cluster. New repeatable --live-images-file merges image refs exported
from other production clusters; missing file surfaces as WARN (reduced
coverage), forgejo-registry tags protected, other registries ignored.
5/5 tests.
Evidence gathered 2026-07-18: activity-core on railiance01 runs a
locally-imported image (activity-core:railiance01-prod), not a forgejo
registry tag — the largest would_delete set has no live registry
consumer. Live forgejo tags: state-hub:main-1cf949b (railiance01),
issue-core:0.2.1 + state-hub:f2e042a + vergabe-teilnahme:064d295
(coulombcore cluster).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>