build(audience): wire CDN bundle build into pnpm build

- Adds transpile:cdn script calling tsup --config ./tsup.cdn.js.
- Orders build as transpile -> transpile:cdn -> typegen; ordering is load-bearing because the CDN config uses clean: false.
- Ships dist/cdn/imtbl-audience.global.js in the published tarball via the existing files: ["dist"] field.
- Studios can hotlink via unpkg.com/@imtbl/audience/dist/cdn/imtbl-audience.global.js until the CDN deploy pipeline lands.

Refs SDK-115

Author: ImmutableJeffrey

packages/audience/sdk/package.json

@@ -52,8 +52,9 @@
   },
   "repository": "immutable/ts-immutable-sdk.git",
   "scripts": {
-    "build": "pnpm transpile && pnpm typegen",
+    "build": "pnpm transpile && pnpm transpile:cdn && pnpm typegen",
     "transpile": "tsup --config tsup.config.js",
+    "transpile:cdn": "tsup --config ./tsup.cdn.js",
     "typegen": "tsc --customConditions default --emitDeclarationOnly --outDir dist/types && rollup -c rollup.dts.config.js && find dist/types -name '*.d.ts' ! -name 'index.d.ts' -delete",
     "lint": "eslint ./src --ext .ts,.jsx,.tsx --max-warnings=0",
     "pack:root": "pnpm pack --pack-destination $(dirname $(pnpm root -w))",