📝 Add docstrings to agent/save-export-workflow

[coderabbitai]

Docstrings generation was requested by @ChrisBeWithYou.

• feat(editor): separate project saves from library exports #352 (comment)

The following files were modified:

• routes.py
• src/create.js
• src/file-ops.js
• src/main.js
• src/replace-audio.js
• src/stem-tracks.js
• tests/test_create_save_destination.py

These files were ignored

• tests/create_save_routing.test.mjs
• tests/editor_back_guard.test.mjs
• tests/first_save_picker.test.mjs

These file types are not supported

• CHANGELOG.md
• README.md
• docs/USER-GUIDE.md
• screen.html

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[coderabbitai]

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[ChrisBeWithYou]

Closing after the parent PR audit. The generated docstrings include inaccurate async/return contracts and interrupt several existing explanatory comment blocks, so merging this would reduce documentation quality. The parent #352 has been reviewed, fixed, and fully tested directly.