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

artemis/config/exploration.py

@@ -8,7 +8,7 @@ from pydantic import BaseModel, ConfigDict, Field, model_validator
 class ExplorationConfig(BaseModel):
     model_config = ConfigDict(extra="forbid")
 
-    model: str = Field(default="gpt-6.1-sol", min_length=1, max_length=200)
+    model: str = Field(default="gpt-6.1-terra", min_length=1, max_length=200)
     reasoning_effort: Literal[
         "default", "none", "minimal", "low", "medium", "high", "xhigh", "max"
     ] = "high"