fix: read default_temperature from team.yaml; update docstrings

- Add default_temperature: 0 to config/team.yaml models block
- Read self._default_temperature from models cfg in __init__
- Use self._default_temperature as fallback in complete() instead of hardcoded 0
- Update class docstring to document both default_max_tokens and default_temperature
- Update complete() context param docs to reference team.yaml keys

config/team.yaml

@@ -12,6 +12,7 @@ adapters:
 models:
   provider: anthropic
   default_max_tokens: 4096
+  default_temperature: 0
   capability_map:
     reasoning-heavy:
       anthropic: claude-opus-4-6