chore: flatten src/ to root

utils/crypto.ts

@@ -0,0 +1,13 @@
+// Indirection point for the package.json "browser" field. When bun builds
+// browser-sdk.js with --target browser, this file is swapped for
+// crypto.browser.ts — avoiding a ~500KB crypto-browserify polyfill that Bun
+// would otherwise inline for `import ... from 'crypto'`. Node/bun builds use
+// this file unchanged.
+//
+// NOTE: `export { randomUUID } from 'crypto'` (re-export syntax) breaks under
+// bun-internal's bytecode compilation — the generated bytecode shows the
+// import but the binding doesn't link (`ReferenceError: randomUUID is not
+// defined`). The explicit import-then-export below produces a correct live
+// binding. See integration-tests-ant-native failure on PR #20957/#21178.
+import { randomUUID } from 'crypto'
+export { randomUUID }