fix: map reasoning_effort max to Claude output_config.effort (#707)

Co-authored-by: Fwind43 <Fwind43@users.noreply.github.com>

Prevents silent downgrade of reasoning_effort=max to medium under fake_cc_system_prompt.

llmcore.py

@@ -590,7 +590,7 @@ class BaseSession:
                     thinking["budget_tokens"] = self.thinking_budget_tokens; payload["thinking"] = thinking
             else: payload["thinking"] = thinking
         if self.reasoning_effort:
-            effort = {'low': 'low', 'medium': 'medium', 'high': 'high', 'xhigh': 'max'}.get(self.reasoning_effort)
+            effort = {'low': 'low', 'medium': 'medium', 'high': 'high', 'xhigh': 'max', 'max': 'max'}.get(self.reasoning_effort)
             if effort: payload["output_config"] = {"effort": effort}
             else: print(f"[WARN] reasoning_effort {self.reasoning_effort!r} is unsupported for Claude output_config.effort, ignored.")
     def ask(self, prompt):