v0.3.0

Added

• PowerShell shell integration: powershell.exe and pwsh now emit the OSC 133
  semantic-prompt marks and OSC 7 cwd that zsh/bash/fish already do, injected
  via -EncodedCommand after the user's profile loads (their config is never
  touched). This turns on the inline line editor at the PowerShell prompt — so
  clicking positions the caret and new tabs/splits inherit the working
  directory — which is what previously made mouse clicks a no-op at the prompt
  on Windows.

Fixed

• Typing exit (or Ctrl-D) left a dead "process exited" pane behind instead
  of closing it. A pane whose shell genuinely ends now closes itself —
  collapsing its split, or closing the tab when it was the only pane (the
  last tab falls back to the home page), like every other terminal. A pane
  that merely lost its daemon connection still stays visible: auto-closing
  those would silently discard — and kill — sessions that may still be alive
  daemon-side. Panes that died while detached clean themselves up on the next
  attach the same way.

• A full-screen TUI dying without restoring the terminal — the canonical case
  being an ssh session dropping mid-htop/vim — left the pane stranded on
  the alt screen with a hidden cursor and live mouse reporting: a visible
  prompt with no cursor anywhere, mouse clicks echoing 0;19;42M-style junk,
  and broken scrollback. The client now scrubs this residue the moment the
  shell reports its next prompt (OSC 133): it leaves the stranded alt screen,
  re-shows the DECTCEM-hidden cursor, and disables stale mouse/focus reporting
  and kitty keyboard flags — each reset only when its mode is actually set.
  Reattach self-heals the same way, since the daemon replays the prompt state
  after the ring.

• Windows shell integration never engaged even for the default shell: detection
  keyed off portable-pty's get_shell(), which reports %ComSpec% (cmd.exe)
  regardless of what's actually spawned, so the PowerShell default was mistaken
  for an unsupported shell. It now resolves to powershell.exe directly.