Rollout: complete WorldVM agent guidance and docs checks

[bjacobso]

Summary

Complete the WorldVM child-project rollout by linking the family hub in the README and adding root contributor guidance for coding agents. Keep the existing VitePress generation of agent docs, put pre-1.0 maturity and installation in its summary, and validate the built index and every local link.

Template IDs and verification

• family: README now links to https://worldvm.com near the end. Verify the sentence above License.
• agents-md: new root AGENTS.md describes setup, pnpm check, repository layout, conventions, and boundaries using existing commands. There is no CLAUDE.md to redirect.
• llms-txt: the docs-generated summary now states pre-1.0 maturity and the published install command. pnpm docs:build produces dist/llms.txt; pnpm docs:preview serves it as HTTP 200 text/plain.
• llms-tested, llms-links: scripts/check-llms.mjs runs after every docs build, including through pnpm check and CI. It requires the H1, summary, maturity, installation, sections, and annotated absolute HTTPS links; verifies local targets are real built files; and rejects HTML fallbacks. All 22 links pass in the built preview as HTTP 200 text/markdown, and all 22 current live links return HTTP 200.
• check, ci, conductor (verified): the existing root check and PR workflow remain in place; .conductor/settings.toml already installs with the frozen lockfile and exposes pnpm check.
• github-meta (verified): description is already “An Effect-native fact database for applications that have to explain themselves.” and homepage is already https://triplex.build. No metadata edit was needed.
• ci-green (verified): the latest completed CI run on main at 2104cd3 succeeded: https://github.com/bjacobso/triplex/actions/runs/37727521967. No default-branch CI fix was needed.
• readme, license, site (verified): existing README explains installation and maturity, root LICENSE is present, and the canonical HTTPS site is available.

Verification

• pnpm install --frozen-lockfile — passed.
• pnpm check — passed, including package and docs builds and the new llms validator.
• pnpm exec playwright test e2e/docs-home.spec.ts --grep 'agent-readable' — passed, including the new text/plain assertion.
• Built preview: /llms.txt is HTTP 200 text/plain and byte-identical to the built file; every indexed Markdown page is HTTP 200 text/markdown.
• Manual validator failure checks: missing file, H1, summary, maturity, install, sections, nonexistent linked page, index HTML shell, and linked HTML shell all failed as intended; original output was restored and passes.

No repository blockers remain. The updated live summary and default-branch files await merge and the existing deployment workflow; no manual deployment, package publication, or merge was performed. This changes documentation and validation only, so no Changeset is needed.

Final status: repository changes complete and local checks passing; ready for review and normal CI/deployment after merge.

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