feat: name the Ghostty tab after the branch

[johnpangalos]

What

wt switch / wt root now name the new tab/window after the branch, on by default. Set WT_NO_TITLE to opt out.

Why it's done this way

Ghostty's AppleScript surface configuration has no settable title — the name property on window/tab/terminal is read-only in the scripting dictionary, and the surface configuration record only exposes cwd, command, initial input, wait-after-command, and env vars. So we can't set the title through the same AppleScript path wt uses.

Instead we set it the way any program does: wrap the surface command so it emits an OSC 2 ; <branch> BEL sequence before exec-ing the editor:

```
/bin/bash -c 'printf "\033]2;branch\007"; exec /path/to/nvim'
```

This composes cleanly with the two existing quirks:

• Ghostty already runs the surface command as bash -c "exec <cmd>", so the outer exec hands straight off to our wrapper — no lingering shell, and wait after command semantics are preserved (the editor is still the final process).
• The \033/\007 survive AppleScript's asString escaping because printf (not AppleScript) interprets them.

Caveat

The title only sticks for programs that don't set their own. Editors like Neovim ('title' off by default) leave it alone, so it reads as the branch name. A shell with a prompt title hook (e.g. Ghostty shell integration) will overwrite it. This is documented in the README note and the wrapCmdWithTitle docstring.

Title value

Branch name, falling back to the worktree's directory basename for a detached/bare checkout.

Tests

• wrapCmdWithTitle is tested by actually running the wrapper through bash exactly as Ghostty does and asserting the real OSC-2 bytes emitted — covering the full quoting pipeline, shell metacharacters/quotes in titles, and control-character stripping.
• CLI tests cover the default-on wrapping and the WT_NO_TITLE opt-out.
• Full suite (76) + tsc --noEmit green.

🤖 Generated with Claude Code