Upgrade Astro 5 → 6 and Starlight 0.34 → 0.38

[ejntaylor]

Summary

• Bumps Astro to v6, Starlight to v0.38, and Astro-6-compatible releases of starlight-openapi, starlight-llms-txt, and astro-og-canvas.
• Adds @astrojs/compiler-rs as an explicit dependency so Rollup can resolve Astro's dynamic import during the static build (Astro 6 ships a dynamic import("@astrojs/compiler-rs") but does not declare it in its own dependencies).
• Two small code changes for v6:
  • src/content.config.ts: import z from astro/zod (the astro:content re-export is deprecated in v6).
  • src/pages/open-graph/[...route].js: rename slug → id (Astro 6 removed the legacy content-collection backwards-compat shim, so docsLoader entries now expose id only) and await OGImageRoute(...) (its return type is now a Promise).

Versions

Package	From	To
astro	^5.9.2	^6.0.0 (resolves to 6.1.9)
@astrojs/starlight	^0.34.3	^0.38.4
@astrojs/sitemap	^3.4.1	^3.7.2
starlight-openapi	^0.22.1	^0.25.0
starlight-llms-txt	^0.5.1	^0.8.1
astro-og-canvas	^0.5.3	^0.11.1
@astrojs/compiler-rs	—	^0.1.9 (new)

Test plan

• npm install succeeds with no peer-dependency errors
• npm run build completes (190 pages, including all three OpenAPI references and OG images)
• npm run dev boots; home page returns 200
• Spot-check sidebar navigation, search (Pagefind), and OpenAPI reference pages in a deploy preview
• Verify generated llms.txt / llms-full.txt look right
• Confirm OG images render correctly (Twitter / Slack share preview)

Notes

• Node ≥ 22.12.0 is now required (Astro 6 dropped Node 18/20). Local dev uses Node 22.19.0 — confirm CI / Netlify build image.
• No usage of Astro.glob, <ViewTransitions />, emitESMImage, loadManifest, loadApp, NodeApp, or ASSETS_PREFIX in the codebase, so the major v6 removals don't apply here.

🤖 Generated with Claude Code

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Dependency update with supporting changes.

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