feat(backends,storage,core,markdown,infra): claude agent sdk backend, session store, transcript seeding, runner isolation

src/beaver_gateway/settings.py

@@ -27,6 +27,12 @@ class Settings(BaseSettings):
     internal_mcp_port: int = 8765
     config_path: Path = Path("/config/config.py")
 
+    claude_runner_user: str | None = None
+    """Unix user the claude subprocess runs as. Needs the gateway to be root."""
+
+    claude_home: Path | None = None
+    """``HOME`` for the claude subprocess (its ``~/.claude`` lives there)."""
+
     raycast_bearer: str | None = None
     raycast_config_path: Path = Path("/config/raycast.json")
     raycast_device_id: str | None = None