- discover worktrees from `git worktree list` on each source checkout, not only
the worktree root, so hand-made ones, stale registrations and orphaned
directories are classified too
- normalise each candidate to its main checkout, so a linked worktree in the
source root cannot offer up the repo's real checkout
- keep locked, mid-rebase and detached-with-unique-commits worktrees, whose
removal would destroy state nothing else holds
- name the retained branch in every unproven verdict
- add --no-fetch, --json, --include-unmanaged and --include-keep
unkin-agent
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