fix: resolve TS type errors, duplicate exports, and lint issues

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

src/utils/deprecation.ts

@@ -109,7 +109,11 @@ export function deprecated<T extends (...args: unknown[]) => unknown>(
  * whenever the class is instantiated.
  */
 export function deprecatedClass(options: DeprecationOptions = {}) {
-  return <T extends new (...args: unknown[]) => object>(Base: T, ctx?: { name?: string }): T => {
+  // biome-ignore lint/suspicious/noExplicitAny: mixin class requires any[] per TypeScript spec
+  return <T extends new (...args: any[]) => object>(
+    Base: T,
+    ctx?: { name?: string },
+  ): T => {
     const name = ctx?.name ?? Base.name;
     return class extends Base {
       constructor(...args: any[]) {