Tonefold 1.4.0

FLVSTX is now Tonefold: a standalone composer app first, with the CLAP/VST3 plugin as an optional
add-on for DAWs. It is open source under GPL-3.0-or-later, and it runs on macOS as well as Windows.

macOS

• A universal app for Apple Silicon and Intel Macs (macOS 11+), shipped as a .dmg with the
  optional CLAP and VST3 plugins beside it.
• Fixed the editor drawing at half size in a corner of the window on Retina displays.
• The composer finds Node.js from Homebrew or nvm even when Tonefold is opened from the Finder, and
  installs its own dependencies on the first chat message.
• Data lives in ~/Library/Application Support/Tonefold.

Everywhere

• The installer installs the app by default, with no administrator prompt. Add -Plugins for the
  CLAP and VST3 (one UAC prompt). The FL Studio piano-roll script is added only when FL Studio is
  installed.
• New name everywhere: the plugin (Tonefold.clap, Tonefold.vst3), the app, the CLI
  (tonefold-cli), the crates (tonefold-*), the FL piano-roll script and the external-AI skill
  (tonefold-song).
• Projects that used FLVSTX need Tonefold inserted in its place: the plugin IDs changed with the
  name, so FL Studio treats it as a different plugin.
• The installer carries %LOCALAPPDATA%\FLVSTX (soundfont, exports) over to
  %LOCALAPPDATA%\Tonefold and removes the old shortcut, script and skill. Run with -Plugins,
  it also removes the old FLVSTX plugin files.
• Settings are now TONEFOLD_* environment variables; the old FLVSTX_* names still work.
• agent/package-lock.json is committed, so npm ci works from a fresh clone.
• Release packages now include the GeneralUser GS soundfont instead of downloading it from its
  author's repository, as the author asks.
• The editor opens at 1280×800, which fits a 13-inch laptop screen.
• Contributor docs, issue templates, CI on macOS and Windows, and a release workflow that builds
  both downloads.