Consolidate Synth Index SDK, MCP, Swarms, and Intern

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 All notable changes to the `synth-ai` package are documented here.
 
+## Unreleased
+
+### Removed
+
+- **Grok / xAI** (breaking enum change). `SmrAgentModel.X_AI_GROK_BUILD`,
+  `SmrAgentModel.CURSOR_GROK_4_5`, `ActorModel.GROK_BUILD` /
+  `DeprecatedActorModel.GROK_BUILD`, and the `xai` member of
+  `ResourceProvider`, `SmrCredentialProvider`, `SmrInferenceProvider`,
+  `CredentialProvider`, and `InferenceProvider` are gone, as is `xai` from the
+  public provider selection. The backend no longer serves `x-ai/grok-build`
+  or `cursor/grok-4.5`; use `openrouter/openai/gpt-5.6-luna`.
+
 ## 0.19.0 — 2026-09-14
 
 ### Added

README.md

@@ -140,6 +140,32 @@ CLI discovery:
 synth-ai research --help
 ```
 
+Project creation also accepts the backend-owned `ProjectSpec.policy` mapping.
+For example, a server-enabled fresh project can request
+`policy={"host_resource_custody_mode": "horizons_docker_sessions_only"}`.
+The backend validates this restricted mode and owns its immutable resource
+binding; SDK serialization does not grant additional authority.
+
+## Container pools
+
+The optional `synth-ai[pools]` extra exposes the canonical `synth-containers`
+client through `AsyncSynthClient.pools`. It uses the same configured backend
+credential and keeps hosted admission, resource ownership, and recovery in the
+backend. The enclosing async client closes the pool transport.
+
+```python
+from synth_ai import AsyncSynthClient
+
+async def inspect_lease(lease_id: str, task_id: str):
+    async with AsyncSynthClient() as client:
+        return await client.pools.get_lease_interactive(lease_id, task_id=task_id)
+```
+
+For explicit lifetime management, `from synth_ai.pools import PoolClient`
+re-exports the same implementation. Research-only installations do not import
+this optional dependency. Development candidates must install the exact pinned
+containers wheel; an unpublished candidate extra is not a release claim.
+
 ## CLI
 
 ```bash