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/services/anonymization.ts

@@ -52,7 +52,7 @@ export interface AnonymizedProject {
   anonymousId: string
   title: string
   description: string | null
-  tags: string[]
+  tags: Array<{ name: string; confidence: number }>
   teamName: string | null
 }
 
@@ -209,6 +209,7 @@ interface ProjectInput {
   title: string
   description?: string | null
   tags: string[]
+  tagConfidences?: Array<{ name: string; confidence: number }>
   teamName?: string | null
 }
 
@@ -253,7 +254,9 @@ export function anonymizeForAI(
         description: project.description
           ? truncateAndSanitize(project.description, DESCRIPTION_LIMITS.ASSIGNMENT)
           : null,
-        tags: project.tags,
+        tags: project.tagConfidences && project.tagConfidences.length > 0
+          ? project.tagConfidences
+          : project.tags.map((t) => ({ name: t, confidence: 1.0 })),
         teamName: project.teamName ? `Team ${index + 1}` : null,
       }
     }
@@ -524,7 +527,7 @@ export function validateAnonymization(data: AnonymizationResult): boolean {
     if (!checkText(project.title)) return false
     if (!checkText(project.description)) return false
     for (const tag of project.tags) {
-      if (!checkText(tag)) return false
+      if (!checkText(typeof tag === 'string' ? tag : tag.name)) return false
     }
   }