fix(13-01): parse structured_output from Claude CLI response

- Add structured_output field to ClaudeCliResult interface
- Read from structured_output when present (--json-schema response)
- Fall back to parsing result for backwards compatibility

src/agent/manager.ts

@@ -39,6 +39,9 @@ import {
 
 /**
  * Result structure from Claude CLI with --output-format json
+ *
+ * When --json-schema is used, structured output is in `structured_output` field.
+ * The `result` field may be empty or contain the raw text.
  */
 interface ClaudeCliResult {
   type: 'result';
@@ -46,6 +49,7 @@ interface ClaudeCliResult {
   is_error: boolean;
   session_id: string;
   result: string;
+  structured_output?: unknown; // Present when --json-schema is used
   total_cost_usd?: number;
 }
 
@@ -187,7 +191,9 @@ export class ClaudeAgentManager implements AgentManager {
         await this.repository.updateSessionId(agentId, cliResult.session_id);
       }
 
-      const rawOutput = JSON.parse(cliResult.result);
+      // When --json-schema is used, structured output is in structured_output field
+      // Falls back to parsing result if structured_output is not present (backwards compatible)
+      const rawOutput = cliResult.structured_output ?? JSON.parse(cliResult.result);
       const active = this.activeAgents.get(agentId);
 
       // Parse output based on agent mode