Headless `open_file` (and `file.open` through run_command) had its own
loader that stopped at .vectorcraft and .svg, so an agent could not open
a PDF or an .ai file without the desktop app, although the engine and
`vectorcraft-cli` already import them through vectorcraft-pdf.
The headless loader now imports .pdf, .ai and any file starting with
%PDF through vectorcraft_pdf::import_with_report (default options, as
File ▸ Open uses), and returns the import warnings like the SVG path.
The open_file tool description lists the new types.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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