v0.6.0

Added

• Windows out-of-box support (AI-CLI-29):
  • Platform-aware config/state/cache paths: %APPDATA%\ai-cli-utils (config), %LOCALAPPDATA%\ai-cli-utils (state/cache) on Windows; XDG paths unchanged on Linux/macOS.
  • Replaced fcntl.flock with portalocker (cross-platform file locking); portalocker>=2.0 is now a hard dependency.
  • Added psutil>=5.9 as a hard dependency; extracted _pid_alive() helper in config.py using psutil.pid_exists(). All os.kill(pid, 0) calls eliminated.
  • SIGTERM calls replaced with psutil.Process(pid).terminate() (cross-platform).
  • Lock file paths use tempfile.gettempdir() instead of /tmp literals.
  • Null device references use os.devnull instead of "/dev/null".
  • UTF-8 stdout guard in quota.py prevents UnicodeEncodeError for emoji output on Windows (cp1252 default encoding).
  • ai c/ai g on Windows prints a clear error and MSYS2 install instructions if tmux is not found.
  • Optional [notify-win] extra (pip install "ai-cli-utils[notify-win]") enables Windows toast notifications via plyer. Silently degrades if not installed.
  • CI matrix expanded to include windows-latest for Python 3.11, 3.12, 3.13.