fix(memory): change InfinityDB fallback log from warning to debug

On platforms without InfinityDB support (like Darwin arm64), the mock
implementation is expected behavior. Logging at debug level instead of
warning reduces noise in logs.

pkg/hanzo-memory/src/hanzo_memory/db/client.py

@@ -20,7 +20,7 @@ try:
 
     logger.info("Using InfinityDB")
 except ImportError:
-    logger.warning(
+    logger.debug(
         f"InfinityDB not available on {platform.system()} {platform.machine()}, using mock implementation"
     )
     from . import mock_infinity as infinity_embedded