Forgejo has no per-package /versions endpoint — the list endpoint returns one
entry per (name, version). build_delete_plans now groups list results by name
instead of calling a 404ing /versions sub-path. Removed dead list_versions/_paginate.
Added retry + longer timeout to _api_request for slow/large registry listings
(container list was timing out). Updated fixture test to the grouped model.
Dry-run now clean: 29 candidate deletions across 5 container packages, 0 errors
(was 53× HTTP 404). ACTIVITY-WP-0020 T02 fix; enable/apply still gated on
protection-coverage review (T05).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
List and optionally delete package versions beyond the newest three,
protecting production Helm image tags. Adds Make targets and unit tests
for ACTIVITY-WP-0020.
