Merge PR #229: fix(agent): copy conversation_history to avoid mutating caller's list

Authored by Farukest. Fixes #228.

# Conflicts:
#	tests/test_run_agent.py

run_agent.py

@@ -2777,8 +2777,8 @@ class AIAgent:
         self._turns_since_memory = 0
         self._iters_since_skill = 0
         
-        # Initialize conversation
-        messages = conversation_history or []
+        # Initialize conversation (copy to avoid mutating the caller's list)
+        messages = list(conversation_history) if conversation_history else []
         
         # Hydrate todo store from conversation history (gateway creates a fresh
         # AIAgent per message, so the in-memory store is empty -- we need to