feat(docs): add llms.txt generation and the Context7 configuration

[myromartsin]

Summary

The docs build now generates llms.txt, llms-full.txt, and llms-small.txt for AI assistant retrieval through a Starlight plugin. A root context7.json controls how Context7 indexes the repository, with parsing scoped to the documentation and package READMEs and retrieval rules for coding agents.

Motivation

Coding assistants answer phone-number questions from indexed documentation. Context7 currently carries the incumbent libraries and lacks Telixon.

Conformance impact

None.

Checklist

• Tests added or updated (or a rationale for why none)
• pnpm test, pnpm lint, pnpm format pass locally
• Docs reflect the change (per CONTRIBUTING.md)
• Commit message follows the project convention

[github-actions]

Site preview: https://5c1ecc4a.telixon-landing.pages.dev

[codspeed-hq]

Merging this PR will not alter performance

✅ 39 untouched benchmarks

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_{Comparing feat/ai-discoverability (5ffe521) with main (0efb17a)}