SDK: Add ensureServer() for automatic server recovery (#260)

* 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>

* Fix SDK typecheck errors and update persist drivers for insertEvent signature

- Fix insertEvent call in client.ts to pass sessionId as first argument
- Update Daytona provider create options to use Partial type (image has default)
- Update StrictUniqueSessionPersistDriver in tests to match new insertEvent signature
- Sync persist packages, openapi spec, and docs with upstream changes

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

* Add Modal and ComputeSDK built-in providers, update examples and docs

- Add `sandbox-agent/modal` provider using Modal SDK with node:22-slim image
- Add `sandbox-agent/computesdk` provider using ComputeSDK's unified sandbox API
- Update Modal and ComputeSDK examples to use new SDK providers
- Update Modal and ComputeSDK deploy docs with provider-based examples
- Add Modal to quickstart CodeGroup and docs.json navigation
- Add provider test entries for Modal and ComputeSDK
- Remove old standalone example files (modal.ts, computesdk.ts)

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

* Fix Modal provider: pre-install agents in image, fire-and-forget exec for server

- Pre-install agents in Dockerfile commands so they are cached across creates
- Use fire-and-forget exec (no wait) to keep server alive in Modal sandbox
- Add memoryMiB option (default 2GB) to avoid OOM during agent install

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

* Sync upstream changes: multiplayer docs, logos, openapi spec, foundry config

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

* SDK: Add ensureServer() for automatic server recovery

Add ensureServer() to SandboxProvider interface to handle cases where the
sandbox-agent server stops or goes to sleep. The SDK now calls this method
after 3 consecutive health-check failures, allowing providers to restart the
server if needed. Most built-in providers (E2B, Daytona, Vercel, Modal,
ComputeSDK) implement this. Docker and Cloudflare manage server lifecycle
differently, and Local uses managed child processes.

Also update docs for quickstart, architecture, multiplayer, and session
persistence; mark persist-* packages as deprecated; and add ensureServer
implementations to all applicable providers.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

* wip

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -43,9 +43,42 @@
 - Regenerate `docs/openapi.json` when HTTP contracts change.
 - Keep `docs/inspector.mdx` and `docs/sdks/typescript.mdx` aligned with implementation.
 - Append blockers/decisions to `research/acp/friction.md` during ACP work.
-- `docs/agent-capabilities.mdx` lists models/modes/thought levels per agent. Update it when adding a new agent or changing `fallback_config_options`. If its "Last updated" date is >2 weeks old, re-run `cd scripts/agent-configs && npx tsx dump.ts` and update the doc to match. Source data: `scripts/agent-configs/resources/*.json` and hardcoded entries in `server/packages/sandbox-agent/src/router/support.rs` (`fallback_config_options`).
+- Each agent has its own doc page at `docs/agents/<name>.mdx` listing models, modes, and thought levels. Update the relevant page when changing `fallback_config_options`. To regenerate capability data, run `cd scripts/agent-configs && npx tsx dump.ts`. Source data: `scripts/agent-configs/resources/*.json` and hardcoded entries in `server/packages/sandbox-agent/src/router/support.rs` (`fallback_config_options`).
 - Some agent models are gated by subscription (e.g. Claude `opus`). The live report only shows models available to the current credentials. The static doc and JSON resource files should list all known models regardless of subscription tier.
 
+## Adding Providers
+
+When adding a new sandbox provider, update all of the following:
+
+- `sdks/typescript/src/providers/<name>.ts` — provider implementation
+- `sdks/typescript/package.json` — add `./<name>` export, peerDependencies, peerDependenciesMeta, devDependencies
+- `sdks/typescript/tsup.config.ts` — add entry point and external
+- `sdks/typescript/tests/providers.test.ts` — add test entry
+- `examples/<name>/` — create example with `src/index.ts` and `tests/<name>.test.ts`
+- `docs/deploy/<name>.mdx` — create deploy guide
+- `docs/docs.json` — add to Deploy pages navigation
+- `docs/quickstart.mdx` — add tab in "Start the sandbox" step, add credentials entry in "Passing LLM credentials" accordion
+
+## Adding Agents
+
+When adding a new agent, update all of the following:
+
+- `docs/agents/<name>.mdx` — create agent page with usage snippet and capabilities table
+- `docs/docs.json` — add to the Agents group under Agent
+- `docs/quickstart.mdx` — add tab in the "Create a session and send a prompt" CodeGroup
+
+## Persist Packages (Deprecated)
+
+- The `@sandbox-agent/persist-*` npm packages (`persist-sqlite`, `persist-postgres`, `persist-indexeddb`, `persist-rivet`) are deprecated stubs. They still publish to npm but throw a deprecation error at import time.
+- Driver implementations now live inline in examples and consuming packages:
+  - SQLite: `examples/persist-sqlite/src/persist.ts`
+  - Postgres: `examples/persist-postgres/src/persist.ts`
+  - IndexedDB: `frontend/packages/inspector/src/persist-indexeddb.ts`
+  - Rivet: inlined in `docs/multiplayer.mdx`
+  - In-memory: built into the main `sandbox-agent` SDK (`InMemorySessionPersistDriver`)
+- Docs (`docs/session-persistence.mdx`) link to the example implementations on GitHub instead of referencing the packages.
+- Do not re-add `@sandbox-agent/persist-*` as dependencies anywhere. New persist drivers should be copied into the consuming project directly.
+
 ## Install Version References
 
 - Channel policy:
@@ -74,6 +107,7 @@
   - `examples/docker/src/index.ts`
   - `examples/e2b/src/index.ts`
   - `examples/vercel/src/index.ts`
+  - `sdks/typescript/src/providers/shared.ts`
   - `scripts/release/main.ts`
   - `scripts/release/promote-artifacts.ts`
   - `scripts/release/sdk.ts`