POLYTONE toolchain — https://polytone.lan-solo.com/

  ptc            the compiler/runner:  ./ptc run examples/first_image.pt
  polytone-lsp   the language server (stdio JSON-RPC)
  stdlib/        found automatically next to the binary
  examples/      .pt programs and native media documents

macOS note: unsigned binary — allow it once with:
  xattr -d com.apple.quarantine ptc polytone-lsp
