fix: SQLite UNIQUE constraint - event ID 冲突修复

问题：重复 ask 时 event.id / task_attempt.id 冲突
根因：event ID 格式 `evt_${task.id}_created` 无时间戳

修复：
- Scheduler.generate_event_id() 加 timestamp + random
- 所有 event ID 用 generate_event_id() 生成
- attempt_id / agent_id / workspace_id 加时间戳

round3-G G3 bug 修复验证通过：55 events 正常写入，无 UNIQUE 错误

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

packages/runtime/src/scheduler/Scheduler.ts

@@ -64,6 +64,11 @@ export class Scheduler {
   /**
    * Create tasks from specifications.
    */
+  // Generate unique event ID with timestamp to avoid collisions on repeated asks
+  private generate_event_id(prefix: string): string {
+    return `${prefix}_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`
+  }
+
   async create_tasks(tasks: Array<{ id: TaskID; type: string; title: string; description?: string; depends_on?: string[]; task_spec?: Record<string, unknown> }>): Promise<void> {
     for (const task of tasks) {
       this.graph.add_task({
@@ -77,7 +82,7 @@ export class Scheduler {
 
       // Emit task.created events (INV-1: via event store for projection)
       await this.event_ingestor.ingest({
-        id: `evt_${task.id}_created`,
+        id: this.generate_event_id(`evt_${task.id}_created`),
         type: 'task.created',
         version: 1,
         session_id: this.context.session_id,
@@ -162,12 +167,13 @@ export class Scheduler {
       case 'DISPATCHING': {
         const runnable = this.graph.get_runnable_tasks()
         for (const task of runnable) {
-          const agent_id = `agent_${task.id}`
+          const agent_id = `agent_${task.id}_${Date.now()}`
 
           // INV-1: Emit task.started event (durable) for projection
           const now = new Date().toISOString()
+          const timestamp = Date.now()
           await this.event_ingestor.ingest({
-            id: `evt_${task.id}_started`,
+            id: this.generate_event_id(`evt_${task.id}`),
             type: 'task.started',
             version: 1,
             session_id: this.context.session_id,
@@ -175,7 +181,7 @@ export class Scheduler {
             timestamp: now,
             source: { kind: 'scheduler' },
             route: ['scheduler', 'dispatch'],
-            payload: { task_id: task.id, agent_id, attempt_id: `${task.id}_1`, attempt_index: 0, workspace_id: `ws_${task.id}` }
+            payload: { task_id: task.id, agent_id, attempt_id: `${task.id}_${timestamp}`, attempt_index: 0, workspace_id: `ws_${task.id}_${timestamp}` }
           })
 
           if (this.worker_manager) {
@@ -198,7 +204,7 @@ export class Scheduler {
 
               // INV-1: Emit agent.started event (durable) for projection
               await this.event_ingestor.ingest({
-                id: `evt_${agent_id}_started`,
+                id: this.generate_event_id(`evt_${agent_id}`),
                 type: 'agent.started',
                 version: 1,
                 session_id: this.context.session_id,
@@ -220,7 +226,7 @@ export class Scheduler {
             } catch {
               // INV-1: emit task.failed event for projection
               await this.event_ingestor.ingest({
-                id: `evt_${task.id}_failed`,
+                id: this.generate_event_id(`evt_${task.id}`),
                 type: 'task.failed',
                 version: 1,
                 session_id: this.context.session_id,
@@ -228,7 +234,7 @@ export class Scheduler {
                 timestamp: new Date().toISOString(),
                 source: { kind: 'scheduler' },
                 route: ['scheduler', 'dispatch'],
-                payload: { task_id: task.id, agent_id, attempt_id: `${task.id}_1`, error: { message: 'Worker spawn failed' }, evidence_refs: [], metadata: {} }
+                payload: { task_id: task.id, agent_id, attempt_id: `${task.id}_${Date.now()}`, error: { message: 'Worker spawn failed' }, evidence_refs: [], metadata: {} }
               })
             }
           } else {
@@ -247,7 +253,7 @@ export class Scheduler {
           if (hb) {
             const now = new Date().toISOString()
             await this.event_ingestor.ingest({
-              id: `evt_${hb.task_id}_lost`,
+              id: this.generate_event_id(`evt_${hb.task_id}`),
               type: 'agent.lost',
               version: 1,
               session_id: this.context.session_id,
@@ -271,7 +277,7 @@ export class Scheduler {
             case 'soft_cancel':
               if (task_id) {
                 await this.event_ingestor.ingest({
-                  id: `evt_${task_id}_cancelled`,
+                  id: this.generate_event_id(`evt_${task_id}`),
                   type: 'agent.cancelled',
                   version: 1,
                   session_id: this.context.session_id,
@@ -298,10 +304,10 @@ export class Scheduler {
             const result = this.worker_manager.get_result_for_task(task.id)
             if (!handle || !result) continue
 
-            const attempt_id = `${task.id}_1`
+            const attempt_id = `${task.id}_${Date.now()}`
             if (result.status === 'completed') {
               await this.event_ingestor.ingest({
-                id: `evt_${task.id}_completed`,
+                id: this.generate_event_id(`evt_${task.id}`),
                 type: 'task.completed',
                 version: 1,
                 session_id: this.context.session_id,
@@ -322,7 +328,7 @@ export class Scheduler {
               this.graph.update_status(task.id, 'completed')
               // INV-1: Emit agent.completed event (durable) for projection
               await this.event_ingestor.ingest({
-                id: `evt_${handle.worker_id}_completed`,
+                id: this.generate_event_id(`evt_${handle.worker_id}`),
                 type: 'agent.completed',
                 version: 1,
                 session_id: this.context.session_id,
@@ -335,7 +341,7 @@ export class Scheduler {
               this.agent_monitor.remove(handle.worker_id)
             } else if (result.status === 'blocked') {
               await this.event_ingestor.ingest({
-                id: `evt_${task.id}_blocked`,
+                id: this.generate_event_id(`evt_${task.id}`),
                 type: 'task.blocked',
                 version: 1,
                 session_id: this.context.session_id,
@@ -349,7 +355,7 @@ export class Scheduler {
               this.agent_monitor.remove(handle.worker_id)
             } else if (result.status === 'cancelled') {
               await this.event_ingestor.ingest({
-                id: `evt_${task.id}_cancelled_result`,
+                id: this.generate_event_id(`evt_${task.id}`),
                 type: 'task.cancelled',
                 version: 1,
                 session_id: this.context.session_id,
@@ -363,7 +369,7 @@ export class Scheduler {
               this.agent_monitor.remove(handle.worker_id)
             } else {
               await this.event_ingestor.ingest({
-                id: `evt_${task.id}_failed_result`,
+                id: this.generate_event_id(`evt_${task.id}`),
                 type: 'task.failed',
                 version: 1,
                 session_id: this.context.session_id,
@@ -376,7 +382,7 @@ export class Scheduler {
               this.graph.update_status(task.id, 'failed')
               // INV-1: Emit agent.failed event (durable) for projection
               await this.event_ingestor.ingest({
-                id: `evt_${handle.worker_id}_failed`,
+                id: this.generate_event_id(`evt_${handle.worker_id}`),
                 type: 'agent.failed',
                 version: 1,
                 session_id: this.context.session_id,