feat(council): define litellm-backed tier policy

skills/council/scripts/council-plan.py

@@ -29,12 +29,15 @@ def resolve_plan(mode: str, tier: str):
 
     for role, cfg in roles.items():
         mission = cfg.get('mission', 'advisor')
-        override = tier_policy.get('synthesisModel') if mission == 'synthesis' else tier_policy.get('advisorModel')
+        is_synthesis = mission == 'synthesis'
+        override = tier_policy.get('synthesisModel') if is_synthesis else tier_policy.get('advisorModel')
+        thinking = tier_policy.get('synthesisThinking') if is_synthesis else tier_policy.get('advisorThinking')
         plan['roles'][role] = {
             'agentId': cfg['agentId'],
             'mission': mission,
             'defaultModel': cfg.get('defaultModel'),
             'modelOverride': override,
+            'thinkingOverride': thinking,
             'fallbacks': cfg.get('fallbacks', [])
         }
     return plan