feat: add governed embedding client with batching

src/polygateway/__init__.py

@@ -6,7 +6,8 @@
 """
 
 from polygateway.client import GatewayClient, gather_bounded
-from polygateway.config import GatewaySettings
+from polygateway.config import EmbeddingSettings, GatewaySettings
+from polygateway.embedding import EmbeddingClient
 from polygateway.errors import (
     AllSourcesExhausted,
     CircuitOpenError,
@@ -18,8 +19,9 @@ from polygateway.errors import (
     SourceDeadError,
     TransientError,
 )
+from polygateway.pricing import ModelPrice, PricingTable
 from polygateway.providers import DEFAULT_PROFILES, ProviderProfile, register_provider
-from polygateway.types import LLMResponse, SourceConfig
+from polygateway.types import EmbeddingResponse, LLMResponse, SourceConfig
 
 __version__ = "0.1.0"
 
@@ -27,12 +29,17 @@ __all__ = [
     "DEFAULT_PROFILES",
     "AllSourcesExhausted",
     "CircuitOpenError",
+    "EmbeddingClient",
+    "EmbeddingResponse",
+    "EmbeddingSettings",
     "GatewayClient",
     "GatewaySettings",
     "GatewayUnavailableError",
     "GovernanceBackendError",
     "LLMResponse",
+    "ModelPrice",
     "PolyGatewayError",
+    "PricingTable",
     "ProviderProfile",
     "RequestRejectedError",
     "ResultInvalidError",