ISR / SSG layer on top of @vitejs/plugin-rsc — feedback welcome

[fwx5618177]

Small project sitting on top of @vitejs/plugin-rsc: adds an ISR cache layer
(LRU + Redis, tag-based invalidation), an SSG spider, and a csr-shell
fallback for when SSR throws. Vite 8 + React 19 + Express 5. Doesn't
reimplement the Flight protocol — that's still the official plugin's job.

Consumer-side it's three files (vite.config.ts, package.json, src/app.tsx)
with zero extra Vite config.

It's alpha — only one site is using it. Posting here because I'd like a
review from people who know Vite RSC internals before I take it further.
Specific things I'd like opinions on:

1. ISR cache as Express middleware vs migrating to Vite 8 environments API
2. The csr-shell fallback concept (is there prior art?)
3. Subpath exports that ship as raw .tsx because plugin-rsc needs to see
   'use client' directives — is there a recommended pattern?

Repo:
Not pitching a Next.js replacement. Honestly looking for pushback.