chore(8.0): final pre-RC1 sweep — API consistency, named errors, orphans, zero-cast codebase

src/unified.ts

@@ -18,8 +18,18 @@ export const environment = {
   }
 }
 
+declare global {
+  /**
+   * Runtime-environment marker published by the unified entry point so
+   * embedders and diagnostics can detect the active Brainy environment.
+   * Ambient `var` is required — `let`/`const` in `declare global` do not
+   * attach to `globalThis`.
+   */
+  var __ENV__: typeof environment | undefined
+}
+
 if (typeof globalThis !== 'undefined') {
-  ;(globalThis as any).__ENV__ = environment
+  globalThis.__ENV__ = environment
 }
 
 console.log(