feat: add native AsyncDynavec client

pyproject.toml

@@ -42,6 +42,7 @@ sentence-transformers = ["sentence-transformers>=3.0"]
 # bedrock needs nothing beyond boto3.
 
 # --- Optional capabilities ---
+async = ["aioboto3>=13"]
 rerank = ["sentence-transformers>=3.0"]         # cross-encoder reranking
 redis = ["redis>=5.0"]                            # RedisCache / AWS ElastiCache
 mcp = ["mcp>=1.0; python_version >= '3.10'"]       # MCP client ingestion
@@ -87,7 +88,8 @@ dev = [
     "pytest-asyncio>=0.23",
     "pytest-cov>=5.0",
     "hypothesis>=6.100",
-    "moto[dynamodb]>=5.0",
+    "aioboto3>=13",
+    "moto[dynamodb,server]>=5.0",
     "mypy>=1.11,<2.0",
     "ruff>=0.6",
     "pre-commit>=3.5",

src/dynavec/__init__.py

@@ -20,6 +20,7 @@
 
 from __future__ import annotations
 
+from .async_client import AsyncDynavec
 from .bm25 import BM25Index
 from .cache import BaseCache, DynamoDBCache, RedisCache, SemanticCache, warm_cache
 from .client import Dynavec
@@ -91,6 +92,7 @@
 
 __all__ = [
     "Dynavec",
+    "AsyncDynavec",
     "DynavecConfig",
     "AWSCredentials",
     "Document",