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/persist-indexeddb/tests/driver.test.ts

@@ -28,7 +28,7 @@ describe("IndexedDbSessionPersistDriver", () => {
       destroyedAt: 300,
     });
 
-    await driver.insertEvent({
+    await driver.insertEvent("s-1", {
       id: "evt-1",
       eventIndex: 1,
       sessionId: "s-1",
@@ -38,7 +38,7 @@ describe("IndexedDbSessionPersistDriver", () => {
       payload: { jsonrpc: "2.0", method: "session/prompt", params: { sessionId: "a-1" } },
     });
 
-    await driver.insertEvent({
+    await driver.insertEvent("s-1", {
       id: "evt-2",
       eventIndex: 2,
       sessionId: "s-1",