diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 289a992..b2d5f94 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,12 +10,12 @@ jobs:
     name: Test suite
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Enable Corepack
         run: corepack enable
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: yarn
@@ -27,19 +27,15 @@ jobs:
         run: yarn test
 
   typecheck:
-    name: Typecheck (non-blocking)
+    name: Typecheck
     runs-on: ubuntu-latest
-    # TypeScript strict mode is currently disabled (see review QUAL-10). This job
-    # surfaces type errors without gating merges; promote it to a required check
-    # once the strict-mode cleanup lands.
-    continue-on-error: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Enable Corepack
         run: corepack enable
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: yarn
@@ -47,5 +43,5 @@ jobs:
       - name: Install dependencies
         run: yarn install --immutable
 
-      - name: vue-tsc
-        run: yarn vue-tsc --noEmit
+      - name: Typecheck (vue-tsc --build)
+        run: yarn typecheck
diff --git a/package.json b/package.json
index be2a561..d9f338a 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "preview": "nuxt preview",
     "start": "node .output/server/index.mjs",
     "postinstall": "nuxt prepare",
+    "typecheck": "vue-tsc --build",
     "sharp:rebuild": "SHARP_IGNORE_GLOBAL_LIBVIPS=1 yarn rebuild sharp",
     "import:decision": "tsx --tsconfig tsconfig.scripts.json scripts/import-decision-tree.ts",
     "test": "tsx --tsconfig tsconfig.tests.json --test \"tests/**/*.test.ts\" \"server/**/*.test.ts\" \"shared/**/*.test.ts\""
diff --git a/server/models/UsageEvent.ts b/server/models/UsageEvent.ts
index ebbc448..d8f0f92 100644
--- a/server/models/UsageEvent.ts
+++ b/server/models/UsageEvent.ts
@@ -5,7 +5,11 @@ const { Schema } = mongoose
 export type UsageKind = 'stt' | 'tts' | 'llm'
 export type UsageProvider = 'openai' | 'speaches' | 'piper' | 'cache'
 
-export interface UsageEventDocument extends mongoose.Document {
+// Plain attribute shape (not extending mongoose.Document). Extending Document
+// collides on `model` (Document.model is a method); passing the attrs type to
+// the Schema/Model generics is the recommended pattern and still yields
+// hydrated documents with all Document methods from queries/create.
+export interface UsageEventAttrs {
   user?: mongoose.Types.ObjectId
   sessionId?: string
   kind: UsageKind
@@ -23,7 +27,7 @@ export interface UsageEventDocument extends mongoose.Document {
   createdAt: Date
 }
 
-const usageEventSchema = new mongoose.Schema<UsageEventDocument>({
+const usageEventSchema = new mongoose.Schema<UsageEventAttrs>({
   user: { type: Schema.Types.ObjectId, ref: 'User', index: true },
   sessionId: { type: String },
   kind: { type: String, enum: ['stt', 'tts', 'llm'], required: true },
@@ -41,5 +45,5 @@ const usageEventSchema = new mongoose.Schema<UsageEventDocument>({
 usageEventSchema.index({ user: 1, createdAt: -1 })
 
 export const UsageEvent =
-  (mongoose.models.UsageEvent as mongoose.Model<UsageEventDocument> | undefined) ||
-  mongoose.model<UsageEventDocument>('UsageEvent', usageEventSchema)
+  (mongoose.models.UsageEvent as mongoose.Model<UsageEventAttrs> | undefined) ||
+  mongoose.model<UsageEventAttrs>('UsageEvent', usageEventSchema)