Summary

#130 (Phase 3: delete operation)

This is the final phase of #130. With this PR, all bare repository operations are now supported:

• Phase 1: list command (feat: support list command in bare repositories #140)
• Phase 2: add/switch commands (feat: support add/switch operations in bare repositories #147)
• Phase 3: delete command (this PR)
• Phase X: some refactoring with repo_context and e2e/bare_test (Extra)

Changes

• Enable git wt -d <branch> and git wt -D <branch> in bare repositories and worktrees created from bare repos
• Remove AssertNotBareRepository() guard for delete operations
• Add IsBareEntry() to detect and protect the bare repository root entry from deletion
• Add HeadBranch() to resolve the branch HEAD points to (used for bare entry detection by branch name)
• Protect bare entry from deletion via both branch name (git wt -d main) and path (git wt -d .)
• Remove "bare repositories not supported" notes from README and CLI help (all operations now supported)
• Extract shared test helpers (createBareWorktree, commitUnmergedChange, assertLastLine) for bare delete tests

Behavior

Delete from bare root

$ cd /tmp/repo.git
$ git wt feature          # create worktree
$ git wt -d feature       # safe delete: works
$ git wt -d main          # delete bare entry: error
cannot delete bare repository entry "main": the bare repository root cannot be removed as a worktree

Delete from bare-derived worktree

$ cd /tmp/.wt/feature
$ git wt -d other-branch  # delete another worktree: works
$ git wt -D feature       # delete current worktree: works (cd back to bare root via shell integration)

Delete bare entry via path

$ cd /tmp/repo.git
$ git wt -d .             # error: bare entry protected
cannot delete bare repository entry ".": the bare repository root cannot be removed as a worktree

Test plan

• E2E: safe delete of linked worktree from bare root
• E2E: force delete of worktree with unmerged commits from bare root
• E2E: deleting bare entry by branch name returns error
• E2E: deleting bare entry by path (.) returns error
• E2E: delete other worktree from bare-derived worktree
• E2E: delete current worktree from inside (shell integration cd to bare root)
• E2E: delete last worktree, cd back to bare root
• E2E: safe delete fails with modified files, suggests -D
• E2E: dotgit bare variant (core.bare=true) delete works

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