TanStack Start: a real public app, unchanged, for the pitch (sandboxed trial, Chrome and binary) #2167

For pitching Rusty Buns to TanStack users: take a popular public TanStack Start app, ideally one on Cloudflare with D1 or KV, and run it unchanged in a sandbox, the way the terraviz trial ran (#2153). Show it in Chrome and as a desktop binary.

• Use scripts/trial-github.ts (empty HOME, dead Cloudflare credentials). No deploys and no plan.
• Pick from the TanStack Start sample in FRAMEWORK_COVERAGE.md, or a well-known Start app.
• Fix what init gets wrong in the same PR, and file what it can't fix.
• If it uses Git LFS, see trial-github: fetch Git LFS files (trials get pointer files instead of images) #2165 first.

The reference app, apps/tanstack-start-example, already shows the Cloudflare plugin path working (server functions, a server route, D1, KV, compiled binary).

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