Summary

#130 (Phase 2: add/switch operations)

• Enable git wt <branch> (add/switch mode) in bare repositories and worktrees created from bare repos
• Remove AssertNotBareRepository() guard for add/switch operations
• Remove duplicate RepoRoot() (identical to CurrentWorktree())
• Extract prepareAdd() / copyAfterAdd() helpers to share bare-aware logic between AddWorktree and AddWorktreeWithNewBranch
• Skip file copying when running from bare root (no working tree to copy from)
• Skip bare entries in FindWorktreeByBranchOrDir() to prevent matching the bare root as a worktree target
• Fix ExcludeDirs logic: when source worktree is inside the basedir (bare-derived worktree), do not exclude the basedir from copy

Behavior

From bare root

$ cd /tmp/repo.git
$ git wt feature
# Creates new worktree with new branch "feature"
# No file copying (bare root has no working tree)

$ git wt feature
# Switches to existing worktree (outputs path)

From bare-derived worktree

$ cd /tmp/.wt/main
$ git wt feature2
# Creates new worktree with new branch "feature2"
# Copies untracked/ignored/modified files from current worktree (same as normal repos)

Operations NOT yet supported in bare repos

• git wt -d <branch> (delete) — still returns error mentioning "bare"

Notes

• I noticed that staged new files (added with git add but not yet committed) are not being copied. However, since this is out of scope for this PR, I’m leaving it as-is for now.

Test plan

• Unit tests for AddWorktree / AddWorktreeWithNewBranch from bare repository
• Unit tests for FindWorktreeByBranchOrDir bare entry skipping
• E2E tests for direct bare add (new branch)
• E2E tests for direct bare add with existing branch
• E2E tests for direct bare add with start-point
• E2E tests for bare switch to existing worktree
• E2E tests for dotgit bare add (core.bare=true layout)
• E2E tests for worktree-from-bare add
• E2E tests for worktree-from-bare add with file copying (--copyuntracked)
• E2E tests for bare add chain (bare → wt A → wt B → switch back)
• E2E tests confirming delete still returns errors for bare repos

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