feat: add gpt-6.1-terra and default exploration to high reasoning

mcp_server/tools/exploration.py

@@ -43,7 +43,7 @@ async def mobile_exploration(
     after the user requests deletion. Independent validation runs are preserved.
     Read-only list/get/case never execute tasks. create stores {goal,config?,task_config?};
     start/continue explicitly enqueue or resume Pro exploration. Independent defaults:
-    gpt-6.1-sol/high, 1800 active seconds; timeout pauses, never fails by itself.
+    gpt-6.1-terra/high, 1800 active seconds; timeout pauses, never fails by itself.
     message payload={text}; answer pending questions or guide without discarding history.
     demonstrate payload={source:'android'|'computer'|'both'} pauses at a safe point and
     records while retaining the device/plugin lease. Wait for recording before the user