feat: expose executor job observability

ops/src/pages/admin/OrchestratorPage.tsx

@@ -173,7 +173,7 @@ export function OrchestratorPage() {
         <div>
           <h3 style={{ margin: 0 }}>Executor Gateway</h3>
           <p style={{ margin: '4px 0 0', color: '#68716c', fontSize: 13 }}>
-            Phase 3.3 已持久化 blocked 预览任务；所有执行器仍为 contract-only，不会启动进程或接管任务。
+            Phase 3.4 已开放只读任务状态与事件游标；所有执行器仍为 contract-only，不会启动进程或接管任务。
           </p>
         </div>
         <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(220px, 1fr))', gap: 10 }}>

ops/src/pages/admin/OrchestratorShadowPanel.tsx

@@ -29,6 +29,7 @@ const readinessCheckLabels: Record<string, string> = {
   shadow_mode: '当前保持 Shadow',
   service_healthy: '服务健康',
   durable_checkpoint: '持久化 checkpoint',
+  durable_executor_job_store: '持久化 Executor Job Store',
   observe_only: '仅观察不执行',
   sample_volume: '有效样本量',
   shadow_success_rate: 'Shadow 成功率',
@@ -301,6 +302,13 @@ export function OrchestratorShadowPanel() {
               {selected.remote.error.code}: {selected.remote.error.message}
             </p>
           ) : null}
+          {selected.remote.executorJob.error ? (
+            <p className="alert">
+              Executor Job：{selected.remote.executorJob.error.code}
+              {' '}
+              {selected.remote.executorJob.error.message}
+            </p>
+          ) : null}
           <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(300px, 1fr))', gap: 12 }}>
             <div>
               <strong>LangGraph checkpoint</strong>
@@ -315,6 +323,31 @@ export function OrchestratorShadowPanel() {
               </pre>
             </div>
           </div>
+          {selected.remote.executorJob.available ? (
+            <div
+              style={{
+                borderTop: '1px solid #edf1ef',
+                marginTop: 12,
+                paddingTop: 12,
+                display: 'grid',
+                gridTemplateColumns: 'repeat(auto-fit, minmax(300px, 1fr))',
+                gap: 12,
+              }}
+            >
+              <div>
+                <strong>Executor Job 状态</strong>
+                <pre style={{ whiteSpace: 'pre-wrap', overflowWrap: 'anywhere', fontSize: 12 }}>
+                  {JSON.stringify(selected.remote.executorJob.state, null, 2)}
+                </pre>
+              </div>
+              <div>
+                <strong>Executor Job 事件</strong>
+                <pre style={{ whiteSpace: 'pre-wrap', overflowWrap: 'anywhere', fontSize: 12 }}>
+                  {JSON.stringify(selected.remote.executorJob.events, null, 2)}
+                </pre>
+              </div>
+            </div>
+          ) : null}
         </div>
       ) : null}
     </div>