chore: drop redundant helpers.d.ts fmt/gitignore guards

Runtime tsconfig already limits pack to src, so tests/**/*.d.ts is never
emitted during build; the fmt ignore and gitignore entries are unnecessary.

.gitignore

@@ -43,7 +43,6 @@ tools/generated
 # Test & scene outputs
 /test/
 packages/cli/scene/**/outputs/
-**/tests/**/*.d.ts
 
 # Environment variables (sensitive data)
 .env

vite.config.ts

@@ -30,7 +30,4 @@ export default defineConfig({
   run: {
     cache: true,
   },
-  fmt: {
-    ignorePatterns: ["**/tests/**/*.d.ts"],
-  },
 });