Every scenario from the contract, against a real daemon, tmux and git:
collision suffixes with both trees working, foreign directories
sidestepped without adoption, the guarded kill and its refusal
breakdown, save-then-kill succeeding, --force retaining the tree,
natural exits settling dirty and pristine worktrees differently, the
retained list with reasons, reclaim keeping the branch, and the store
surviving a daemon restart.
Worktree specs are built through their wire shape so the tests carry no
reference to WorktreeSpec.cleanup_on_kill, which #87 is removing.
Miguel Palhas
2083911baa