Round system redesign: Phases 1-7 complete

Full pipeline/track/stage architecture replacing the legacy round system.

Schema: 11 new models (Pipeline, Track, Stage, StageTransition,
ProjectStageState, RoutingRule, Cohort, CohortProject, LiveProgressCursor,
OverrideAction, AudienceVoter) + 8 new enums.

Backend: 9 new routers (pipeline, stage, routing, stageFiltering,
stageAssignment, cohort, live, decision, award) + 6 new services
(stage-engine, routing-engine, stage-filtering, stage-assignment,
stage-notifications, live-control).

Frontend: Pipeline wizard (17 components), jury stage pages (7),
applicant pipeline pages (3), public stage pages (2), admin pipeline
pages (5), shared stage components (3), SSE route, live hook.

Phase 6 refit: 23 routers/services migrated from roundId to stageId,
all frontend components refitted. Deleted round.ts (985 lines),
roundTemplate.ts, round-helpers.ts, round-settings.ts, round-type-settings.tsx,
10 legacy admin pages, 7 legacy jury pages, 3 legacy dialogs.

Phase 7 validation: 36 tests (10 unit + 8 integration files) all passing,
TypeScript 0 errors, Next.js build succeeds, 13 integrity checks,
legacy symbol sweep clean, auto-seed on first Docker startup.

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

tests/integration/assignment-preview.test.ts

@@ -0,0 +1,92 @@
+/**
+ * I-005: Assignment API — Preview vs Execute Parity
+ */
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest'
+import { prisma } from '../setup'
+import {
+  createTestUser,
+  createTestProgram,
+  createTestPipeline,
+  createTestTrack,
+  createTestStage,
+  createTestProject,
+  createTestPSS,
+  cleanupTestData,
+} from '../helpers'
+import { previewStageAssignment, executeStageAssignment } from '@/server/services/stage-assignment'
+
+let programId: string
+let userIds: string[] = []
+
+beforeAll(async () => {
+  const program = await createTestProgram({ name: 'Assignment Preview Test' })
+  programId = program.id
+})
+
+afterAll(async () => {
+  await cleanupTestData(programId, userIds)
+})
+
+describe('I-005: Assignment Preview vs Execute Parity', () => {
+  it('preview and execute produce matching assignment pairs', async () => {
+    const admin = await createTestUser('SUPER_ADMIN')
+    userIds.push(admin.id)
+
+    const pipeline = await createTestPipeline(programId)
+    const track = await createTestTrack(pipeline.id)
+    const stage = await createTestStage(track.id, {
+      name: 'Assignment Stage',
+      stageType: 'EVALUATION',
+      status: 'STAGE_ACTIVE',
+    })
+
+    // Create 3 jurors
+    const juror1 = await createTestUser('JURY_MEMBER', { name: 'Juror Preview 1' })
+    const juror2 = await createTestUser('JURY_MEMBER', { name: 'Juror Preview 2' })
+    const juror3 = await createTestUser('JURY_MEMBER', { name: 'Juror Preview 3' })
+    userIds.push(juror1.id, juror2.id, juror3.id)
+
+    // Create 2 projects
+    const proj1 = await createTestProject(programId, { title: 'Preview P1' })
+    const proj2 = await createTestProject(programId, { title: 'Preview P2' })
+    await createTestPSS(proj1.id, track.id, stage.id, { state: 'PENDING' })
+    await createTestPSS(proj2.id, track.id, stage.id, { state: 'PENDING' })
+
+    const config = { requiredReviews: 2 }
+
+    // Step 1: Preview
+    const preview = await previewStageAssignment(stage.id, config, prisma)
+
+    expect(preview.assignments.length).toBeGreaterThan(0)
+    expect(preview.stats.totalProjects).toBe(2)
+
+    // Step 2: Execute with the same pairs from preview
+    const assignmentInputs = preview.assignments.map(a => ({
+      userId: a.userId,
+      projectId: a.projectId,
+    }))
+
+    const execResult = await executeStageAssignment(
+      stage.id, assignmentInputs, admin.id, prisma
+    )
+
+    expect(execResult.created).toBe(assignmentInputs.length)
+    expect(execResult.errors).toHaveLength(0)
+
+    // Step 3: Verify all assignments exist in database
+    const dbAssignments = await prisma.assignment.findMany({
+      where: { stageId: stage.id },
+    })
+
+    expect(dbAssignments.length).toBe(assignmentInputs.length)
+
+    // Verify each preview pair has a matching DB record
+    for (const input of assignmentInputs) {
+      const match = dbAssignments.find(
+        a => a.userId === input.userId && a.projectId === input.projectId
+      )
+      expect(match).toBeDefined()
+    }
+  })
+})