SDK sandbox provisioning: built-in providers, docs restructure, and quickstart overhaul

- Add built-in sandbox providers (local, docker, e2b, daytona, vercel, cloudflare) to the TypeScript SDK so users import directly instead of passing client instances
- Restructure docs: rename architecture to orchestration-architecture, add new architecture page for server overview, improve getting started flow
- Rewrite quickstart to be TypeScript-first with provider CodeGroup and custom provider accordion
- Update all examples to use new provider APIs
- Update persist drivers and foundry for new SDK surface

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sdks/typescript/vitest.config.ts

@@ -4,5 +4,7 @@ export default defineConfig({
   test: {
     include: ["tests/**/*.test.ts"],
     testTimeout: 30000,
+    teardownTimeout: 10000,
+    pool: "forks",
   },
 });