v1.9.0

• Removed shell integration on Windows. To track a pane's working
  directory, pain wrote a startup script to the temp directory and spawned
  the shell against it — --rcfile for bash, -Command for PowerShell,
  and a script executed inside WSL. Windows Defender flagged the result as
  Behavior:Win32/DefensiveEvasion.A!ml and moved to quarantine it, which
  is a fair reading of what that looks like from the outside.

  What it cost: on Windows, a restored session reopens panes in your home
  directory rather than their last working directory. Layout, window size,
  shell and group still restore. cmd.exe never had it. Linux and macOS are
  unaffected — they read the working directory from the OS process table
  and never had anything injected.

  Windows bash also goes back to reading its own startup files rather than
  a generated one.

• font_size and transparency are whole numbers now. transparency is a
  percentage, so 1.0 becomes 100 and 0.7 becomes 70. A config file
  written before this is read and converted rather than rejected — TOML
  tells 70 and 0.7 apart by type — so nothing else in the file reverts.