refactor: use AI SDK cosineSimilarity instead of hand-rolled implementation

[skip northflank]

Author: quotentiroler

backend/src/lib/ai/rag-tools.ts

@@ -3,7 +3,7 @@ import { mkdir, readFile, readdir, writeFile } from 'node:fs/promises'
 import { join, dirname } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { openai } from '@ai-sdk/openai'
-import { embed, embedMany } from 'ai'
+import { cosineSimilarity, embed, embedMany } from 'ai'
 import { logger } from '../logger'
 
 interface RagDocument {
@@ -68,27 +68,7 @@ function ensureAPIKey(): boolean {
   return true
 }
 
-function cosineSimilarity(a: number[], b: number[]): number {
-  if (a.length !== b.length || a.length === 0) {
-    return 0
-  }
-
-  let dot = 0
-  let normA = 0
-  let normB = 0
-
-  for (let i = 0; i < a.length; i++) {
-    dot += a[i] * b[i]
-    normA += a[i] * a[i]
-    normB += b[i] * b[i]
-  }
 
-  if (normA === 0 || normB === 0) {
-    return 0
-  }
-
-  return dot / (Math.sqrt(normA) * Math.sqrt(normB))
-}
 
 async function ensureInitialized(): Promise<void> {
   if (knowledgeBase.length > 0) {

consent-app/package.json

@@ -3,7 +3,7 @@
   "displayName": "Proxy Smart Consent App",
   "description": "SMART on FHIR consent management app — manage FHIR Consent resources for linked Patient records.",
   "private": true,
-  "version": "0.0.2-alpha.202603220311.23c239fe",
+  "version": "0.0.2-alpha.202603220344.599fb64d",
   "type": "module",
   "scripts": {
     "dev": "vite --port 5174",

dtr-app/package.json

@@ -3,7 +3,7 @@
   "displayName": "Proxy Smart DTR App",
   "description": "Da Vinci DTR (Documentation Templates & Rules) — SMART on FHIR app for prior authorization documentation, questionnaire rendering, and CQL-based auto-population.",
   "private": true,
-  "version": "0.0.2-alpha.202603220311.23c239fe",
+  "version": "0.0.2-alpha.202603220344.599fb64d",
   "type": "module",
   "scripts": {
     "dev": "vite --port 5175",

shared-ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@proxy-smart/shared-ui",
-  "version": "0.0.2-alpha.202603220311.23c239fe",
+  "version": "0.0.2-alpha.202603220344.599fb64d",
   "private": true,
   "type": "module",
   "main": "./src/index.ts",