feat(12-03): add decompose mode support to ClaudeAgentManager

- Import decomposeOutputSchema and decomposeOutputJsonSchema from schema.ts
- Update getJsonSchemaForMode() to handle 'decompose' mode
- Add handleDecomposeOutput() method following pattern of handleBreakdownOutput()
- Update handleAgentCompletion() switch to call handleDecomposeOutput for decompose mode
- Handle decompose_complete/questions/unrecoverable_error statuses

src/agent/manager.ts

@@ -33,6 +33,8 @@ import {
   discussOutputJsonSchema,
   breakdownOutputSchema,
   breakdownOutputJsonSchema,
+  decomposeOutputSchema,
+  decomposeOutputJsonSchema,
 } from './schema.js';
 
 /**
@@ -83,6 +85,8 @@ export class ClaudeAgentManager implements AgentManager {
         return discussOutputJsonSchema;
       case 'breakdown':
         return breakdownOutputJsonSchema;
+      case 'decompose':
+        return decomposeOutputJsonSchema;
       case 'execute':
       default:
         return agentOutputJsonSchema;
@@ -194,6 +198,9 @@ export class ClaudeAgentManager implements AgentManager {
         case 'breakdown':
           await this.handleBreakdownOutput(agent, rawOutput);
           break;
+        case 'decompose':
+          await this.handleDecomposeOutput(agent, rawOutput);
+          break;
         case 'execute':
         default:
           await this.handleExecuteOutput(agent, rawOutput, cliResult.session_id);
@@ -473,6 +480,95 @@ export class ClaudeAgentManager implements AgentManager {
     }
   }
 
+  /**
+   * Handle output for decompose mode.
+   * Outputs tasks array when phase decomposition is complete.
+   */
+  private async handleDecomposeOutput(
+    agent: { id: string; name: string; taskId: string | null },
+    rawOutput: unknown
+  ): Promise<void> {
+    const decomposeOutput = decomposeOutputSchema.parse(rawOutput);
+    const active = this.activeAgents.get(agent.id);
+
+    switch (decomposeOutput.status) {
+      case 'decompose_complete': {
+        if (active) {
+          active.result = {
+            success: true,
+            message: `Decompose complete with ${decomposeOutput.tasks.length} tasks`,
+          };
+        }
+        await this.repository.updateStatus(agent.id, 'idle');
+
+        if (this.eventBus) {
+          const event: AgentStoppedEvent = {
+            type: 'agent:stopped',
+            timestamp: new Date(),
+            payload: {
+              agentId: agent.id,
+              name: agent.name,
+              taskId: agent.taskId ?? '',
+              reason: 'decompose_complete',
+            },
+          };
+          this.eventBus.emit(event);
+        }
+        break;
+      }
+
+      case 'questions': {
+        if (active) {
+          active.pendingQuestions = {
+            questions: decomposeOutput.questions,
+          };
+        }
+        await this.repository.updateStatus(agent.id, 'waiting_for_input');
+
+        if (this.eventBus) {
+          const event: AgentWaitingEvent = {
+            type: 'agent:waiting',
+            timestamp: new Date(),
+            payload: {
+              agentId: agent.id,
+              name: agent.name,
+              taskId: agent.taskId ?? '',
+              sessionId: '',
+              questions: decomposeOutput.questions,
+            },
+          };
+          this.eventBus.emit(event);
+        }
+        break;
+      }
+
+      case 'unrecoverable_error': {
+        if (active) {
+          active.result = {
+            success: false,
+            message: decomposeOutput.error,
+          };
+        }
+        await this.repository.updateStatus(agent.id, 'crashed');
+
+        if (this.eventBus) {
+          const event: AgentCrashedEvent = {
+            type: 'agent:crashed',
+            timestamp: new Date(),
+            payload: {
+              agentId: agent.id,
+              name: agent.name,
+              taskId: agent.taskId ?? '',
+              error: decomposeOutput.error,
+            },
+          };
+          this.eventBus.emit(event);
+        }
+        break;
+      }
+    }
+  }
+
   /**
    * Handle agent errors - actual crashes (not waiting for input).
    * With structured output via --json-schema, question status is handled in