feat(audience): bump pixel to v1.0.0 and inject version at build time

Read version from package.json in tsup.config.ts and inject it via
esbuild define as PIXEL_VERSION_INJECTED. This stamps every event
payload with the correct libraryVersion automatically — no manual
bumping needed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: bkbooth

packages/audience/pixel/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@imtbl/pixel",
   "description": "Immutable Tracking Pixel — drop-in JavaScript snippet for device fingerprint, page view, and attribution data",
-  "version": "0.0.0",
+  "version": "1.0.0",
   "author": "Immutable",
   "private": true,
   "bugs": "https://github.com/immutable/ts-immutable-sdk/issues",

packages/audience/pixel/src/globals.d.ts

@@ -0,0 +1,2 @@
+/** Injected at build time by tsup `define` — see tsup.config.ts */
+declare const PIXEL_VERSION_INJECTED: string;

packages/audience/pixel/src/pixel.ts

@@ -24,7 +24,11 @@ import {
   createConsentManager,
 } from '@imtbl/audience-core';
 
-const PIXEL_VERSION = '0.0.0';
+// Replaced at build time by tsup `define` (see tsup.config.ts).
+// In tests the global isn't defined, so we fall back to 'unknown'.
+const PIXEL_VERSION: string = typeof PIXEL_VERSION_INJECTED !== 'undefined'
+  ? PIXEL_VERSION_INJECTED
+  : 'unknown';
 
 export interface PixelInitOptions {
   key: string;

packages/audience/pixel/tsup.config.ts

@@ -1,6 +1,9 @@
 import { resolve } from 'path';
+import { readFileSync } from 'fs';
 import { defineConfig } from 'tsup';
 
+const pkg = JSON.parse(readFileSync(resolve(__dirname, 'package.json'), 'utf-8'));
+
 export default defineConfig({
   entry: ['src/index.ts'],
   outDir: 'dist',
@@ -14,6 +17,9 @@ export default defineConfig({
   sourcemap: false,
   clean: true,
   noExternal: ['@imtbl/audience-core', '@imtbl/metrics'],
+  define: {
+    PIXEL_VERSION_INJECTED: JSON.stringify(pkg.version),
+  },
   outExtension: () => ({ js: '.js' }),
   esbuildOptions(options) {
     options.outbase = 'src';