diff --git a/app/vault/[uuid]/edit/page.tsx b/app/vault/[uuid]/edit/page.tsx
index 24e5d3d..a3c3d4a 100644
--- a/app/vault/[uuid]/edit/page.tsx
+++ b/app/vault/[uuid]/edit/page.tsx
@@ -83,9 +83,9 @@ const CALIBERS_BY_PLATFORM: Record<
 type CaliberOption = string | "";
 
 // -----------------------------
-// Other controlled fields (optional scaffolding)
+// Build Class (controlled list)
 // -----------------------------
-const PURPOSE_OPTIONS = [
+const BUILD_CLASS_OPTIONS = [
   "Home Defense",
   "Duty / Patrol",
   "Training",
@@ -94,7 +94,7 @@ const PURPOSE_OPTIONS = [
   "Range / Fun",
 ] as const;
 
-type PurposeOption = (typeof PURPOSE_OPTIONS)[number] | "";
+type BuildClassOption = (typeof BUILD_CLASS_OPTIONS)[number] | "";
 
 function fmt(d?: string | null) {
   if (!d) return "—";
@@ -133,7 +133,7 @@ export default function EditBuildPage() {
 
     platform: PlatformOption;
     caliber: CaliberOption;
-    purpose: PurposeOption;
+    buildClass: BuildClassOption;
 
     tagsText: string; // comma-separated for MVP
     coverImageUrl: string;
@@ -201,9 +201,11 @@ export default function EditBuildPage() {
           platform: normalizedPlatform,
           caliber: normalizedCaliber,
 
-          purpose: (PURPOSE_OPTIONS.includes((dto.buildClass ?? "") as any)
+          buildClass: (BUILD_CLASS_OPTIONS.includes(
+            (dto.buildClass ?? "") as any
+          )
             ? (dto.buildClass as any)
-            : "") as PurposeOption,
+            : "") as BuildClassOption,
 
           tagsText: Array.isArray(dto.tags) ? dto.tags.join(", ") : "",
           coverImageUrl: dto.coverImageUrl ?? "",
@@ -265,7 +267,7 @@ export default function EditBuildPage() {
         isPublic: !!profile.isPublic,
 
         // Backend expects buildClass (not purpose)
-        buildClass: profile.purpose || null,
+        buildClass: profile.buildClass || null,
 
         caliber: profile.caliber || null,
         coverImageUrl: profile.coverImageUrl?.trim() || null,
@@ -454,24 +456,29 @@ export default function EditBuildPage() {
                 </div>
               </div>
 
-              {/* Purpose */}
+              {/* Build Class */}
               <div>
                 <label className="block text-xs font-medium text-white/70">
-                  Purpose
+                  Build Class
                 </label>
                 <select
-                  value={profile.purpose}
+                  value={profile.buildClass}
                   onChange={(e) =>
                     setProfile((p) =>
-                      p ? { ...p, purpose: e.target.value as PurposeOption } : p
+                      p
+                        ? {
+                            ...p,
+                            buildClass: e.target.value as BuildClassOption,
+                          }
+                        : p
                     )
                   }
                   className="mt-1 w-full rounded-md border border-white/10 bg-black/30 px-3 py-2 text-sm text-white outline-none focus:ring-1 focus:ring-amber-400/60"
                 >
                   <option value="">Select…</option>
-                  {PURPOSE_OPTIONS.map((p) => (
-                    <option key={p} value={p}>
-                      {p}
+                  {BUILD_CLASS_OPTIONS.map((c) => (
+                    <option key={c} value={c}>
+                      {c}
                     </option>
                   ))}
                 </select>
@@ -602,7 +609,7 @@ export default function EditBuildPage() {
                   {profile.caliber || "—"}
                 </span>
                 <span className="rounded-full border border-white/10 bg-white/5 px-2 py-1">
-                  {profile.purpose || "—"}
+                  {profile.buildClass || "—"}
                 </span>
               </div>
 
diff --git a/package-lock.json b/package-lock.json
index b9a4ede..914b921 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1012,6 +1012,7 @@
       "integrity": "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -1452,6 +1453,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.8.25",
         "caniuse-lite": "^1.0.30001754",
@@ -2134,6 +2136,7 @@
       "deprecated": "This version is no longer supported. Please see https://eslint.org/version-support for other options.",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.6.1",
@@ -2302,6 +2305,7 @@
       "integrity": "sha512-whOE1HFo/qJDyX4SnXzP4N6zOWn79WhnCUY/iDR0mPfQZO8wcYE4JClzI2oZrhBnnMUCBCHZhO6VQyoBU95mZA==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@rtsao/scc": "^1.1.0",
         "array-includes": "^3.1.9",
@@ -4531,6 +4535,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.7",
         "picocolors": "^1.0.0",
@@ -4780,6 +4785,7 @@
       "resolved": "https://registry.npmjs.org/react/-/react-18.3.1.tgz",
       "integrity": "sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0"
       },
@@ -4792,6 +4798,7 @@
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-18.3.1.tgz",
       "integrity": "sha512-5m4nQKp+rZRb09LNH59GM4BxTh9251/ylbKIbpe7TpGxfJ+9kv6BLkLBXIjjspbgbnIBNqlI23tRnTWT0snUIw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0",
         "scheduler": "^0.23.2"
@@ -5796,6 +5803,7 @@
       "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -5965,6 +5973,7 @@
       "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
       "dev": true,
       "license": "Apache-2.0",
+      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"