fix: add context isolation in CompositeAgent using deepcopy

src/cleveragents/agents/composite.py

@@ -20,6 +20,7 @@ from ..langgraph.bridge import RxPyLangGraphBridge
 from ..reactive.stream_router import ReactiveStreamRouter
 from ..templates.renderer import TemplateRenderer
 from .base import Agent
+import copy
 
 logger = logging.getLogger(__name__)
 
@@ -168,7 +169,8 @@ class CompositeAgent(Agent):  # pylint: disable=too-many-instance-attributes
 
         This method satisfies the abstract base class requirement.
         """
-        return await self.process(message, context)
+        isolated_context = copy.deepcopy(context)
+        return await self.process(message, isolated_context)
 
     async def process(
         self, message: str, context: Optional[dict[str, Any]] = None