feat: add CDN bundle

Self-contained IIFE (4.0 KB gzipped). window.ImmutableWebSDK global.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ImmutableJeffrey

packages/audience/web/src/cdn.ts

@@ -0,0 +1,24 @@
+/**
+ * Audience web SDK CDN entry point — self-contained IIFE bundle.
+ * Assigns exports to window globals for script-tag usage:
+ *   window.ImmutableWebSDK
+ *   window.AudienceEvent
+ *   window.IdentityProvider
+ */
+import { ImmutableWebSDK, AudienceEvent, IdentityProvider } from './index';
+
+if (typeof window !== 'undefined') {
+  (window as any).ImmutableWebSDK = ImmutableWebSDK;
+  (window as any).AudienceEvent = AudienceEvent;
+  (window as any).IdentityProvider = IdentityProvider;
+}
+
+export { ImmutableWebSDK, AudienceEvent, IdentityProvider };
+export type {
+  EventParamMap,
+  Identity,
+  WebSDKConfig,
+  ConsentLevel,
+  UserTraits,
+  Environment,
+} from './index';

packages/audience/web/tsup.cdn.js

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+// @ts-check
+import { defineConfig } from 'tsup';
+import { replace } from 'esbuild-plugin-replace';
+import pkg from './package.json' assert { type: 'json' };
+
+/**
+ * Audience web SDK CDN bundle — self-contained IIFE exposing window.ImmutableWebSDK.
+ * All dependencies (including @imtbl/audience) are inlined.
+ *
+ * Output: dist/cdn/imtbl-web.js
+ * Usage:  <script src="https://cdn.immutable.com/web-sdk/v1/imtbl-web.js"></script>
+ *         <script>
+ *           var sdk = window.ImmutableWebSDK.init({ ... });
+ *           sdk.track(window.AudienceEvent.Purchase, { currency: 'USD', value: 9.99 });
+ *         </script>
+ */
+export default defineConfig({
+  entry: { 'imtbl-web': 'src/cdn.ts' },
+  outDir: 'dist/cdn',
+  format: 'iife',
+  platform: 'browser',
+  target: 'es2020',
+  minify: true,
+  bundle: true,
+  treeshake: true,
+  noExternal: [/.*/],
+  esbuildPlugins: [
+    replace({
+      '__SDK_VERSION__': pkg.version === '0.0.0' ? '0.1.0' : pkg.version,
+    }),
+  ],
+});