feat(athena): add temperature support to council member schema

Allow per-member temperature overrides in council config. Adds temperature field to CouncilMemberSchema (0-2 range), CouncilMemberConfig type, and auto-generated JSON schema.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/config/schema/athena.ts

@@ -14,6 +14,7 @@ export const CouncilMemberSchema = z.object({
   model: ModelStringSchema,
   variant: z.string().optional(),
   name: z.string().optional(),
+  temperature: z.number().min(0).max(2).optional(),
 }).strict()
 
 export const CouncilConfigSchema = z.object({