Ecosystem documentation tracer

Outcome

Make /docs the canonical public entry point, remove the separate sparse landing experience, and connect AgentsKit Chat to the six sibling products without changing runtime contracts.

Acceptance criteria

• / redirects to /docs, and /docs renders a concise, useful Fumadocs index.
• the index contains a verified quick start, one useful Mermaid diagram, key journeys, six contextual sibling links, and machine-readable documentation entry points.
• the hosted seven-product ecosystem bar identifies AgentsKit Chat as the current product.
• llms.txt and raw Markdown expose the new canonical index without a second prose corpus.

Dependencies and test plan

• Reuse the canonical docs/ corpus, Fumadocs source loader, existing quick start, raw routes, machine surfaces, and hosted ecosystem bar.
• Run docs lint, unit tests, build, E2E accessibility/navigation checks, Doc Bridge index/gate, and exact doctor coverage.

Documentation impact and Definition of Done

This page and docs/index.md are the only new prose. Completion requires the root redirect, canonical metadata, responsive docs rendering, valid links, green checks, and Doc Bridge 100/100.

Upstream-adoption record

• Inspected source: apps/docs, ADR-0027, the canonical quick starts, API reference, and ecosystem adoption docs.
• Reused exports: Fumadocs source, DocsLayout, existing machine routes, and the public AgentsKit Chat documentation contracts.
• Local application behavior: routing, navigation, and documentation presentation only.
• Linked upstream work: none; no framework-neutral runtime gap was found.