Astro: fit test check and IMAGES verification on the edge and a box #312

One place for the open Astro work. This replaces #236, #273 and #274, which are now closed.

1. Fit test: Astro apps are ready (from #236)

Since #223 taught rustybuns init Astro, the fit check says ready for Astro workspaces. On main, apps/codesplitters/test/fit.test.ts already expects verdict: "ready" for the Astro app, so this looks done.

• Confirmed on main (4528c13), 2026-10-10: bun test apps/codesplitters/test/fit.test.ts passes (6 pass, 0 fail), with the Astro app at verdict: "ready".

2. Verify the IMAGES binding on a live Cloudflare deploy (from #273)

#270 adds the images binding (#222). The tests cover the generated wrangler and Alchemy output, and /_image was checked on a desktop dev build. Nobody has deployed it to the edge yet.

1. Make a fresh Astro 7 + @astrojs/cloudflare 14 app with an <Image> on a server-rendered page. Run rustybuns init and confirm IMAGES is in rustybuns.config.ts.
2. Run rustybuns plan, then deploy.
3. Request the page's /_image?href=…&w=32&f=webp URL. It should return a resized WebP, not the original PNG.
4. Destroy the stack afterwards.

Cost: the Worker runs on the free plan, and Cloudflare Images gives 5,000 unique transformations a month for free.

• Step 3 returns a transformed image, and the result is noted in FRAMEWORKS.md.

3. Verify the IMAGES passthrough on a box, Railway (from #274)

On desktop and the box, images is a passthrough: /_image returns the original image, and the host binds env.ASSETS and a no-op caches global. This was checked only on a desktop dev build.

1. Take the same Astro sample app as in section 2 and add targets.box: { provider: "railway" }.
2. Run rustybuns build box, then deploy to the railway-test project.
3. Request /_image?href=…&w=32&f=webp. It should return 200 with the original PNG, byte-identical to dist/client/_astro/*.png.
4. Tear down the service afterwards. railway-test itself stays.

• Step 3 passes, and the result is noted in FRAMEWORKS.md.

Sections 2 and 3 can share one sample app.

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