iglass 1.1.0: Ghostty and real Liquid Glass

Added

• Ghostty support, with Apple's real Liquid Glass material (macos-glass-regular /
  macos-glass-clear) on macOS 26+, and classic blur elsewhere. iglass asks Ghostty's own
  validator whether glass is supported instead of guessing from versions.
• --terminal iterm2|ghostty|all; iglass install defaults to the terminal it runs in.
• --glass auto|native|blur for Ghostty.
• Ghostty edits are minimal and reversible: theme files, an iglass.ghostty settings file,
  and one marked include line in the config Ghostty loads last. Symlinked and read-only
  configs are handled; uninstall restores the config byte for byte.
• doctor, status, preview and export --dir cover Ghostty.
• Prebuilt Ghostty themes in themes/ghostty/.
• Demo GIF and Ghostty screenshots; tools/record-gif.sh and a Ghostty mode for
  tools/screenshots.sh, both over a generated backdrop.

Changed

• install shows tips only on the first install, and a one-line summary when updating.

Fixed

• install.sh stopped with "unbound variable" when downloading a release (bash 3.2 read the
  … in a message as part of a variable name).

Install or upgrade

brew install vukkt/tap/iglass        # or: brew upgrade iglass
# or: curl -fsSL https://raw.githubusercontent.com/vukkt/iglass/main/install.sh | bash
iglass install                       # sets up the terminal you run it in

Requires macOS 15+ and iTerm2 3.5+ or Ghostty 1.0+. Real Liquid Glass needs macOS 26+ and a recent Ghostty. Not affiliated with Apple Inc., iTerm2 or Ghostty.