fix(agents): upgrade coordinator model to Sonnet 4.5 for structured output support

claude-sonnet-4-20250514 does not support output_config (structured outputs).
Changed coordinator model to claude-sonnet-4-5-20250929 which supports it.
Specialist agents remain on their original models (no output_config needed).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/services/conversation-service/src/infrastructure/agents/coordinator/agent-loop.ts

@@ -153,7 +153,7 @@ export async function* agentLoop(
   for (let attempt = 0; attempt <= MAX_RETRIES; attempt++) {
     try {
       stream = anthropicClient.messages.stream({
-        model: 'claude-sonnet-4-20250514',
+        model: 'claude-sonnet-4-5-20250929',
         system: systemPrompt,
         messages: messages as any,
         tools: getToolsForClaudeAPI(additionalTools) as any,

packages/services/conversation-service/src/infrastructure/agents/types/agent.types.ts

@@ -18,7 +18,7 @@ export enum SpecialistAgentType {
 }
 
 /** Agent 模型选择 */
-export type AgentModel = 'claude-sonnet-4-20250514' | 'claude-haiku-4-5-20251001';
+export type AgentModel = 'claude-sonnet-4-5-20250929' | 'claude-sonnet-4-20250514' | 'claude-haiku-4-5-20251001';
 
 /** Agent 配置 */
 export interface AgentConfig {