Ghostty exact-tab focus fails when Claude Code launched via 'claude -w' from parent dir

Summary

focus-window for Ghostty matches the AppleScript-reported working directory of each tab against the notification's cwd. When Claude Code is launched with claude -w <worktree-name> from a parent dir, the shell's cwd never moves into the worktree, so Ghostty reports the parent dir and the candidate set built by ghosttyFocusCandidates (internal/notifier/ax_focus_darwin.go:425) never matches → falls back to AXDocument → window-level focus only (lands on a sibling tab in the same parent).

Repro

cd /repo
claude -w feat/foo                          # Claude internally uses /repo/.claude/worktrees/feat/foo
# Trigger any task_complete notification
# Click → Ghostty activates but stops at the wrong tab (a sibling tab whose Ghostty cwd happens to match /repo)

Evidence

• Claude Code process cwd (correct): /repo/.claude/worktrees/feat/foo (verified via lsof -p <pid> -d cwd)
• Ghostty AppleScript reports for that tab: /repo (parent), not the worktree
• ghosttyFocusCandidates builds [worktree, symlink-resolved-worktree] — neither matches /repo
• Falls through to focusGhosttyWindowByAXDocument → window-level focus only

Ghostty's AppleScript working directory reflects the most recent OSC 7 (shell cd), not the foreground process's cwd. claude -w doesn't move the parent shell's cwd into the worktree, so the discrepancy is permanent for that tab. Note that pre-cd-then-claude is not a workable workaround because -w is typically used to create the worktree on first run, when the worktree path does not yet exist.

Proposed Fixes (ranked)

1. Foreground-process cwd matching (correct, ~80 LOC + cgo) Query each Ghostty tab's foreground PID via AppleScript (tty of every terminal → lsof -t <tty>), then proc_pidinfo for cwd. Match the tab whose foreground process cwd equals the notification cwd. Disambiguates tabs that share a parent dir.

2. Parent-dir fallback (heuristic, ~30 LOC) Extend ghosttyFocusCandidates to walk up parent dirs (stop at git root or filesystem root). Accepts ambiguity when ≥2 tabs share a parent — first match wins.

Happy to send a PR for either, given guidance on which is acceptable.

Environment

• Plugin v1.38.0
• macOS 15.x, arm64
• Ghostty (tip)
• Claude Code with -w flag