Deference reusable content at the API level

[SamyPesse]

TODO:

1. Implement new data API to fetch a document page with reusable content dereferenced
2. For a % of traffic, use it instead of the old method
3. If JSONDocument.meta.token is defined, used this to resolve content-refs within the document

[changeset-bot]

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Latest commit: 6c05575

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-r3uu5ldar-gitbook.vercel.app	✅
Cloudflare	https://3057f42f-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-r3uu5ldar-gitbook.vercel.app/url/gitbook.com/docs	https://3057f42f-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-r3uu5ldar-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://3057f42f-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	✅ No changes detected	-	Dec 5, 2025, 8:36 AM
v2-cloudflare (Inspect)	⚠️ Changes detected (Review)	21 changed, 4 removed, 1 failure	Dec 5, 2025, 8:39 AM
v2-vercel (Inspect)	⚠️ Changes detected (Review)	39 changed, 4 removed, 1 failure	Dec 5, 2025, 8:40 AM