Pass tag confidence scores to AI assignment for weighted matching

The AI assignment path was receiving project tags as flat strings, losing
the confidence scores from AI tagging. Now both the GPT path and the
fallback algorithm weight tag matches by confidence — a 0.9 tag matters
more than a 0.5 one.

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

src/server/routers/assignment.ts

@@ -74,10 +74,22 @@ async function runAIAssignmentJob(jobId: string, roundId: string, userId: string
         description: true,
         tags: true,
         teamName: true,
+        projectTags: {
+          select: { tag: { select: { name: true } }, confidence: true },
+        },
         _count: { select: { assignments: { where: { roundId } } } },
       },
     })
 
+    // Enrich projects with tag confidence data for AI matching
+    const projectsWithConfidence = projects.map((p) => ({
+      ...p,
+      tagConfidences: p.projectTags.map((pt) => ({
+        name: pt.tag.name,
+        confidence: pt.confidence,
+      })),
+    }))
+
     const existingAssignments = await prisma.assignment.findMany({
       where: { roundId },
       select: { userId: true, projectId: true },
@@ -124,7 +136,7 @@ async function runAIAssignmentJob(jobId: string, roundId: string, userId: string
 
     const result = await generateAIAssignments(
       jurors,
-      projects,
+      projectsWithConfidence,
       constraints,
       userId,
       roundId,