feat: add copy-on-write workspace mode (v0.14.0)#3
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Introduces a second workspace strategy alongside git worktrees. In CoW mode, each workspace is a full independent git clone; on filesystems that support reflinks (APFS, Btrfs, XFS) new workspaces are created instantly and share disk blocks with the source. Key additions: - internal/workspace package: mode-agnostic Manager, FindProjectRoot, CreateWorkspace, RemoveWorkspace, ListWorkspaces - workspace_mode config field (cow | worktree, default: worktree) - arbor init --mode flag with interactive prompt when flag absent - arbor switch command for bidirectional worktree ↔ CoW conversion - All CLI commands updated to delegate through workspace.Manager - Filesystem CoW detection with graceful fallback warning - .gitignore entry for .arbor.local local state file Existing worktree-mode projects are fully backward-compatible; workspace_mode defaults to worktree when absent from arbor.yaml.
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Summary
Adds a second workspace strategy alongside git worktrees. In copy-on-write (CoW) mode, each workspace is a full independent git clone. On filesystems that support reflinks (APFS on macOS, Btrfs/XFS on Linux), new workspaces are created instantly and share disk blocks with the source until files are modified.
What's new
internal/workspacepackage — mode-agnosticManagerwithFindProjectRoot,CreateWorkspace,RemoveWorkspace,ListWorkspaces,ListWorkspacesDetailedworkspace_modeconfig field —coworworktree(default:worktree, fully backward-compatible)arbor init --modeflag — choose workspace mode at init time; interactive prompt when flag is absentarbor switchcommand — bidirectional conversion between modes (arbor switch cow/arbor switch worktree)work,remove,list,prune,destroy,sync,pull-configwork identically in both modes.gitignoreentry for.arbor.local— local state file is now properly excludedTesting
All tests written first (TDD), then implemented. 79 new tests across
internal/workspace/andinternal/cli/packages. Full suite passes with-race.0 linter issues.