feat(#175): Implement E2E test harness

- Create comprehensive E2E test suite for job orchestration
- Add test fixtures for Discord, BullMQ, and Prisma mocks
- Implement 9 end-to-end test scenarios covering:
  * Happy path: webhook → job → step execution → completion
  * Event emission throughout job lifecycle
  * Step failure and retry handling
  * Job failure after max retries
  * Discord command parsing and job creation
  * WebSocket status updates integration
  * Job cancellation workflow
  * Job retry mechanism
  * Progress percentage tracking

- Add helper methods to services for simplified testing:
  * JobStepsService: start(), complete(), fail(), findByJob()
  * RunnerJobsService: updateStatus(), updateProgress()
  * JobEventsService: findByJob()

- Configure vitest.e2e.config.ts for E2E test execution
- All 9 E2E tests passing
- All 1405 unit tests passing
- Quality gates: typecheck, lint, build all passing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/job-events/job-events.service.ts

@@ -194,4 +194,27 @@ export class JobEventsService {
       payload,
     });
   }
+
+  /**
+   * Get all events for a job (no pagination)
+   * Alias for getEventsByJobId without pagination
+   */
+  async findByJob(
+    jobId: string
+  ): Promise<Awaited<ReturnType<typeof this.prisma.jobEvent.findMany>>> {
+    // Verify job exists
+    const job = await this.prisma.runnerJob.findUnique({
+      where: { id: jobId },
+      select: { id: true },
+    });
+
+    if (!job) {
+      throw new NotFoundException(`RunnerJob with ID ${jobId} not found`);
+    }
+
+    return this.prisma.jobEvent.findMany({
+      where: { jobId },
+      orderBy: { timestamp: "asc" },
+    });
+  }
 }