[deepagent-ai]

… adapter

Clears all 17 remaining web alerts (16 astro medium/high + 1 @astrojs/cloudflare low). The astro high advisories are only patched in 6.x, so a major bump was required; the third-party docs theme blocked it and Cloudflare's adapter broke under astro 6's prerender pipeline.

• astro 5.7.13 → 6.4.8; coordinated @astrojs bumps: solid-js 6.0.1, markdown-remark 6.3.11, starlight 0.40.0, check 0.9.9
• remove toolbeam-docs-theme (pinned to astro ^5, no astro-6 release, and it dragged astro 5 back into the lockfile): drop its Starlight plugin and switch the Header override to Starlight's built-in @astrojs/starlight/components/Header
• replace @astrojs/cloudflare with @astrojs/node 10.1.4 (standalone) — we deploy locally/self-hosted, not to Cloudflare. The whole web app (docs + the SSR /s/[id] share route) runs under one Node server
• image.service = noop to preserve the adapter's prior passthrough behavior (avoids a new Sharp native dep)

Verified: astro build completes — 631 pages prerendered, search index + sitemap generated, standalone Node server built. astro resolves to a single 6.4.8; no @astrojs/cloudflare or toolbeam left in bun.lock.

Follow-up (not in this dep-cleanup wave): infra/app.ts still deploys web via sst.cloudflare.x.Astro; that deployment wiring needs a separate pass to match the Node adapter.

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