fix: give final acceptance a shared retry budget and diagnostics

apps/showcase_ui/src/app/components/llm-request-status/llm-request-status.component.spec.ts

@@ -1,7 +1,7 @@
 import { fakeAsync, TestBed, tick } from '@angular/core/testing';
 import { provideHttpClient } from '@angular/common/http';
 import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
-import { LlmRequestStatusComponent, ModelRequest, requestHint } from './llm-request-status.component';
+import { FinalReview, LlmRequestStatusComponent, ModelRequest, requestHint, reviewStage } from './llm-request-status.component';
 
 const waiting: ModelRequest = {
   request_id: 'call-1', attempt_id: 'attempt-1', model: 'gpt-6-luna', role: 'FlashRunner',
@@ -78,4 +78,44 @@ describe('模型请求诊断', () => {
     expect(text).toContain('本次工具尚未执行');
     fixture.destroy();
   });
+
+  it('无模型请求时仍展示验收阶段与总预算，耗尽后保留明确原因', fakeAsync(() => {
+    const fixture = TestBed.createComponent(LlmRequestStatusComponent);
+    const http = TestBed.inject(HttpTestingController);
+    const now = Date.now() / 1000;
+    const review: FinalReview = {
+      review_id: 'review-1', attempt_id: 'final#1', status: 'running', stage: 'reading_evidence', active: true,
+      started_at: now - 20, deadline_at: now + 80, total_seconds: 100, elapsed_seconds: 20, remaining_seconds: 80,
+      request_count: 2, retry_count: 1, max_retries: 5
+    };
+    fixture.componentRef.setInput('sessionId', 'review-task');
+    fixture.componentRef.setInput('running', true);
+    fixture.detectChanges();
+    http.expectOne('/api/sessions/review-task/request-diagnostics').flush({ requests: [], final_reviews: [review] });
+    fixture.detectChanges();
+    const text = fixture.nativeElement.querySelector('.review-live').textContent;
+    expect(text).toContain('正在读取验收证据');
+    expect(text).toContain('测试仍为待判定');
+    expect(text).toContain('剩余验收预算 80 秒');
+    expect(text).toContain('已重试 1 次');
+    tick(1000); fixture.detectChanges();
+    expect(fixture.nativeElement.querySelector('.review-live').textContent).toContain('剩余验收预算 79 秒');
+    tick(2000);
+    http.expectOne('/api/sessions/review-task/request-diagnostics').flush({ requests: [], final_reviews: [{
+      ...review, active: false, status: 'budget_exhausted', ended_at: now + 3, elapsed_seconds: 100
+    }] });
+    fixture.detectChanges();
+    expect(fixture.nativeElement.querySelector('.review-live')).toBeNull();
+    expect(fixture.nativeElement.textContent).toContain('验收总预算已用尽');
+    expect(fixture.nativeElement.textContent).toContain('未确认通过');
+    fixture.destroy(); tick(3000);
+    http.expectNone('/api/sessions/review-task/request-diagnostics');
+  }));
+
+  it('区分重试耗尽、验收中断与完成，不把完成当成通过', () => {
+    const review = { status: 'request_retries_exhausted' } as FinalReview;
+    expect(reviewStage(review)).toBe('验收请求重试已用尽');
+    expect(reviewStage({ ...review, status: 'cancelled' })).toBe('验收已中断');
+    expect(reviewStage({ ...review, status: 'completed' })).toBe('验收完成');
+  });
 });