feat(bankai): bankai v10 — the isomorphic compiler & server on Vite 8

One command, zero config, and only the client ever bundles: v8 server
code is plain ESM that Node runs as-authored, so there is no server
build to rot (the lesson of v9).

- start: Vite middleware mode + HMR with per-request streaming SSR via
  ssrLoadModule; a virtual client entry generates the browser glue so
  the user writes exactly one isomorphic module (plan decision D5).
- build: client bundle via Vite 8/Rolldown, manifest-derived route
  assets in dist/bankai.json, service worker built with the precache
  list injected (choo-service-worker convention, manifest edition),
  brotli+gzip precompression of every text asset.
- serve: immutable caching + precompressed negotiation for hashed
  assets, 103 Early Hints (res.writeEarlyHints) with the route's assets
  before every page, streaming SSR, and a window.initialState tail with
  script-breakout-safe serialization and choo internals filtered out.
- inspect: raw/gzip/brotli size report.

Integration tests drive the real counter example through build and
serve, asserting the 103 interim response at the HTTP level.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014NgfSjHE11oFpoSnLVKLXd

package.json

@@ -11,7 +11,7 @@
     "node": ">=24"
   },
   "scripts": {
-    "test": "node --test packages/core/test/ packages/html/test/ packages/component/test/ packages/devtools/test/ packages/migrate/test/",
+    "test": "node --test packages/core/test/ packages/html/test/ packages/component/test/ packages/devtools/test/ packages/migrate/test/ packages/bankai/test/",
     "test:e2e": "node --test test/e2e/",
     "bench": "node bench/render.js",
     "bench:browser": "node bench/real-browser.js"