feat(councils-ui): add on-demand council conversations panel and model config controls

src/config/schema.ts

@@ -865,6 +865,7 @@ const councilsGroupConfigSchema = z.object({
   freethinker_agent: z.string().min(1),
   grounder_agent: z.string().min(1).optional(),
   writer_agent: z.string().min(1).optional(),
+  model_tier: modelTierEnum.default('complex'),
   group_prompt_prefix: z.string().min(1),
   novelty_bias: z.enum(['low', 'medium', 'high']).default('medium'),
   risk_tolerance: z.enum(['low', 'medium', 'high']).default('medium'),
@@ -890,6 +891,7 @@ const councilsSchema = z.object({
     D: councilsGroupConfigSchema.default({
       arbiter_agent: 'council_d_arbiter',
       freethinker_agent: 'council_d_freethinker',
+      model_tier: 'complex',
       group_prompt_prefix: 'Optimize for feasibility and speed-to-test. Prefer boring-but-true.',
       novelty_bias: 'low',
       risk_tolerance: 'low',
@@ -902,6 +904,7 @@ const councilsSchema = z.object({
     P: councilsGroupConfigSchema.default({
       arbiter_agent: 'council_p_arbiter',
       freethinker_agent: 'council_p_freethinker',
+      model_tier: 'complex',
       group_prompt_prefix: 'Optimize for reframing and non-obvious leverage. Weird is fine; label speculation.',
       novelty_bias: 'high',
       risk_tolerance: 'high',
@@ -913,6 +916,7 @@ const councilsSchema = z.object({
     }),
   }).default({}),
   meta_arbiter_agent: z.string().min(1).default('council_meta_arbiter'),
+  meta_model_tier: modelTierEnum.default('complex'),
   meta_writer_agent: z.string().min(1).optional(),
 }).default({});