🐛 Fix options key present with parts during JB 1 upgrade

[bryanwweber]

• fix: allow options key in toc with parts

Closes #1796

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[agoose77]

We definitely should loosen the strictness of TOC handling during upgrade. However, I think the proper solution is to do this in the validation step:

mystmd/packages/myst-cli/src/init/jupyter-book/toc.ts

Lines 172 to 176 in fad8f67

	const BookTOC = z.union([
	BookTOCBase.and(BookShorthandOuterSubtree),
	BookTOCBase.merge(BookHasOuterSubtrees).strict(),
	BookTOCBase.strict(),
	]);

I will circle around to this shortly.

[bryanwweber]

We definitely should loosen the strictness of TOC handling during upgrade. However, I think the proper solution is to do this in the validation step:

mystmd/packages/myst-cli/src/init/jupyter-book/toc.ts

Lines 172 to 176 in fad8f67

	const BookTOC = z.union([
	BookTOCBase.and(BookShorthandOuterSubtree),
	BookTOCBase.merge(BookHasOuterSubtrees).strict(),
	BookTOCBase.strict(),
	]);

I will circle around to this shortly.

Thanks! I'd written to Rowan on discord, I tried to find a way to get Zod to issue a warning, but it doesn't really support that: https://discord.com/channels/1083088970059096114/1177359316886503464/1331659677485891664