fix: remove custom async-disposable shim

Author: mingchuno

AGENTS.md

@@ -23,5 +23,3 @@ Welcome! This file keeps lightweight coordination notes for anyone (human or AI)
 - For complex changes, request a human review to ensure the change aligns with project goals and also ask for clarification on any ambiguous points in the plan.
 
 Thanks for helping keep the project healthy!
-
-// TODO(agent): Husky install failed in this sandbox because `.git/config` was not writable; rerun `npm install` in a normal checkout to populate hooks.

src/types/async-disposable.d.ts

@@ -37,7 +37,7 @@
     // "experimentalDecorators": true /* Enables experimental support for ES7 decorators. */,
     // "emitDecoratorMetadata": true /* Enables experimental support for emitting type metadata for decorators. */,
 
-    "lib": ["es2022"],
+    "lib": ["es2022", "esnext.disposable"],
     "types": ["node"],
     "typeRoots": ["node_modules/@types", "src/types"]
   },