Add factual document and breadcrumb structured data

[tannerlinsley]

Documentation pages now identify their canonical page, technical article, publisher, and library-to-document breadcrumb in JSON-LD. Both generic and framework-specific routes use the same canonical URL they already publish in HTML. Modified dates come only from validated document freshness, and hidden libraries or missing documents emit no schema.

This is stacked on #1264 because the date metadata depends on that PR. JSON is serialized through the site's existing head scripts API with < escaped so authored text cannot close the script element.

Validation: full pnpm test passed, 526 tests passed and 3 skipped, TypeScript and lint clean. No-JavaScript browser checks cover both documentation routes, canonical and title agreement, undated documents, a dated fixture, safe script-like title text, and a missing-document 404. Schema.org's validator reports 0 errors and 0 warnings for the generated Start overview graph. Client navigation replaces the article and breadcrumb metadata without reloading the document or leaving duplicate article entities. All runtime checks passed in the final run.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	tanstack-com	3b5994f	Commit Preview URL Branch Preview URL	Sep 12 2026, 12:32 AM

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