Competition/Round architecture: full platform rewrite (Phases 1-9)

Replace Pipeline/Stage system with Competition/Round architecture.
New schema: Competition, Round (7 types), JuryGroup, AssignmentPolicy,
ProjectRoundState, DeliberationSession, ResultLock, SubmissionWindow.
New services: round-engine, round-assignment, deliberation, result-lock,
submission-manager, competition-context, ai-prompt-guard.
Full admin/jury/applicant/mentor UI rewrite. AI prompt hardening with
structured prompts, retry logic, and injection detection. All legacy
pipeline/stage code removed. 4 new migrations + seed aligned.

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

src/app/(admin)/admin/competitions/[competitionId]/assignments/page.tsx

@@ -0,0 +1,170 @@
+'use client'
+
+import { useState } from 'react'
+import { useParams, useRouter } from 'next/navigation'
+import { ArrowLeft, PlayCircle } from 'lucide-react'
+import { trpc } from '@/lib/trpc/client'
+import { Button } from '@/components/ui/button'
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select'
+import { Skeleton } from '@/components/ui/skeleton'
+import { CoverageReport } from '@/components/admin/assignment/coverage-report'
+import { AssignmentPreviewSheet } from '@/components/admin/assignment/assignment-preview-sheet'
+import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
+
+export default function AssignmentsDashboardPage() {
+  const params = useParams()
+  const router = useRouter()
+  const competitionId = params.competitionId as string
+
+  const [selectedRoundId, setSelectedRoundId] = useState<string>('')
+  const [previewSheetOpen, setPreviewSheetOpen] = useState(false)
+
+  const { data: competition, isLoading: isLoadingCompetition } = trpc.competition.getById.useQuery({
+    id: competitionId,
+  })
+
+  const { data: unassignedQueue, isLoading: isLoadingQueue } =
+    trpc.roundAssignment.unassignedQueue.useQuery(
+      { roundId: selectedRoundId, requiredReviews: 3 },
+      { enabled: !!selectedRoundId }
+    )
+
+  const rounds = competition?.rounds || []
+  const currentRound = rounds.find((r) => r.id === selectedRoundId)
+
+  if (isLoadingCompetition) {
+    return (
+    <div className="container mx-auto space-y-6 p-4 sm:p-6">
+        <Skeleton className="h-10 w-full" />
+        <Skeleton className="h-96 w-full" />
+      </div>
+    )
+  }
+
+  if (!competition) {
+    return (
+    <div className="container mx-auto space-y-6 p-4 sm:p-6">
+        <p>Competition not found</p>
+      </div>
+    )
+  }
+
+  return (
+    <div className="container mx-auto space-y-6 p-4 sm:p-6">
+      <Button variant="ghost" onClick={() => router.back()} className="mb-4" aria-label="Back to competition details">
+        <ArrowLeft className="mr-2 h-4 w-4" />
+        Back to Competition
+      </Button>
+
+      <div className="flex flex-col sm:flex-row justify-between items-start sm:items-center gap-4">
+        <div>
+          <h1 className="text-3xl font-bold">Assignment Dashboard</h1>
+          <p className="text-muted-foreground">Manage jury assignments for rounds</p>
+        </div>
+      </div>
+
+      <Card>
+        <CardHeader>
+          <CardTitle>Select Round</CardTitle>
+          <CardDescription>Choose a round to view and manage assignments</CardDescription>
+        </CardHeader>
+        <CardContent>
+          <Select value={selectedRoundId} onValueChange={setSelectedRoundId}>
+            <SelectTrigger className="w-full sm:w-[300px]">
+              <SelectValue placeholder="Select a round..." />
+            </SelectTrigger>
+            <SelectContent>
+              {rounds.length === 0 ? (
+                <div className="px-2 py-1 text-sm text-muted-foreground">No rounds available</div>
+              ) : (
+                rounds.map((round) => (
+                  <SelectItem key={round.id} value={round.id}>
+                    {round.name} ({round.roundType})
+                  </SelectItem>
+                ))
+              )}
+            </SelectContent>
+          </Select>
+        </CardContent>
+      </Card>
+
+      {selectedRoundId && (
+        <div className="space-y-6">
+          <div className="flex justify-end">
+            <Button onClick={() => setPreviewSheetOpen(true)}>
+              <PlayCircle className="mr-2 h-4 w-4" />
+              Generate Assignments
+            </Button>
+          </div>
+
+          <Tabs defaultValue="coverage" className="w-full">
+            <TabsList className="grid w-full grid-cols-2">
+              <TabsTrigger value="coverage">Coverage Report</TabsTrigger>
+              <TabsTrigger value="unassigned">Unassigned Queue</TabsTrigger>
+            </TabsList>
+
+            <TabsContent value="coverage" className="mt-6">
+              <CoverageReport roundId={selectedRoundId} />
+            </TabsContent>
+
+            <TabsContent value="unassigned" className="mt-6">
+              <Card>
+                <CardHeader>
+                  <CardTitle>Unassigned Projects</CardTitle>
+                  <CardDescription>
+                    Projects with fewer than 3 assignments
+                  </CardDescription>
+                </CardHeader>
+                <CardContent>
+                  {isLoadingQueue ? (
+                    <div className="space-y-2">
+                      {[1, 2, 3].map((i) => (
+                        <Skeleton key={i} className="h-16 w-full" />
+                      ))}
+                    </div>
+                  ) : unassignedQueue && unassignedQueue.length > 0 ? (
+                    <div className="space-y-2">
+                      {unassignedQueue.map((project: any) => (
+                        <div
+                          key={project.id}
+                          className="flex justify-between items-center p-3 border rounded-md"
+                        >
+                          <div>
+                            <p className="font-medium">{project.title}</p>
+                            <p className="text-sm text-muted-foreground">
+                              {project.competitionCategory || 'No category'}
+                            </p>
+                          </div>
+                          <div className="text-sm text-muted-foreground">
+                            {project.assignmentCount || 0} / 3 assignments
+                          </div>
+                        </div>
+                      ))}
+                    </div>
+                  ) : (
+                    <p className="text-sm text-muted-foreground">
+                      All projects have sufficient assignments
+                    </p>
+                  )}
+                </CardContent>
+              </Card>
+            </TabsContent>
+          </Tabs>
+
+          <AssignmentPreviewSheet
+            roundId={selectedRoundId}
+            open={previewSheetOpen}
+            onOpenChange={setPreviewSheetOpen}
+          />
+        </div>
+      )}
+    </div>
+  )
+}