Illustrator native roundtrip

Use this capability when the buyer requires editable native Illustrator source rather than a renamed or
PDF-compatible file whose Illustrator private-data roundtrip is unproved.

Run:

python3 scripts/illustrator_native_roundtrip.py INPUT.svg OUTPUT.ai --receipt RECEIPT.json

The CLI opens the source in the installed Adobe Illustrator application, saves with
IllustratorSaveOptions(pdfCompatible=true), closes it, reopens the produced .ai, and records the exact
reopened path, safe document structure, hashes, and Illustrator private-data markers. A successful receipt has
status=ok, positive layers and artboards, a distinct source/output hash, and native_private_data=true.
Do not enumerate every page item merely as a receipt: complex vector documents can make Illustrator
recursively traverse the full artwork and crash.

This copies the native IllustratorSaveOptions/Document.saveAs pattern from
creold/illustrator-scripts commit 9b3e3eeade9ba748f41612ec4697bb6a5c2489c2, file
jsx/Export-selection-as-AI.jsx (saveToDoc), under its MIT license. The capability deliberately omits that
tool's selection-copy UI and applies only the proven native save primitive.

Do not use this tool to send files, operate a marketplace, bypass macOS privacy prompts, or claim visual
correctness. It proves native editability only; the Project Owner and fresh visual evaluator still own content
and buyer-fit review.