Switch LLM provider to z.ai GLM

tests/test_zai_llm.py

@@ -0,0 +1,34 @@
+from micro_agents.conversation import Conversation, ReasoningMessage, ToolCallMessage, ToolCallResponseMessage, UserMessage
+
+from llm_trade_bot.zai_llm import ZaiLLM
+
+
+def test_serializes_glm_tool_round_in_chat_completions_format():
+    conversation = Conversation(
+        [
+            UserMessage("analyse BTC"),
+            ReasoningMessage("I need market data."),
+            ToolCallMessage("call-1", "get_market_data", {"symbol": "BTCUSDT"}),
+            ToolCallResponseMessage("call-1", '{"last_price":"100000"}'),
+        ]
+    )
+
+    messages = ZaiLLM._serialize_conversation(conversation, "Follow the risk limits.")
+
+    assert messages == [
+        {"role": "system", "content": "Follow the risk limits."},
+        {"role": "user", "content": "analyse BTC"},
+        {
+            "role": "assistant",
+            "content": None,
+            "reasoning_content": "I need market data.",
+            "tool_calls": [
+                {
+                    "id": "call-1",
+                    "type": "function",
+                    "function": {"name": "get_market_data", "arguments": '{"symbol":"BTCUSDT"}'},
+                }
+            ],
+        },
+        {"role": "tool", "tool_call_id": "call-1", "content": '{"last_price":"100000"}'},
+    ]