Follow-up for salvaged PR #69141, addressing the last open review point:
cmd_prune() only set orphan_allowlist inside 'if orphans or pre_v2_orphans',
so a zero-orphan preview passed the unrestricted None sentinel down to
prune_checkpoints(), authorizing deletion of any project that became
orphaned between the preview and the rescan — with zero confirmation
calls. The allowlist is now bound unconditionally for every non-force
run (empty preview => empty allowlist); --force keeps None. Adds the
zero-orphan-preview timing regression plus allowlist-identity tests.
Requested by egilewski on #69141: the orphan confirmation flow had no
test coverage at all before this. Exercises hermes_cli.checkpoints.cmd_prune
directly against pre-v2-only and mixed (v2 + pre-v2) fake stores —
decline aborts with nothing deleted, accept deletes both layouts,
--force and --keep-orphans skip the prompt as expected.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
