asdf

Squash the current repository state back into one baseline commit while
preserving the README reframing and repository contents.

Constraint: User explicitly requested a single squashed commit with subject "asdf"
Confidence: high
Scope-risk: broad
Reversibility: clean
Directive: This commit intentionally rewrites published history; coordinate before future force-pushes
Tested: git status clean; local history rewritten to one commit; force-pushed main to origin and instructkr
Not-tested: Fresh clone verification after push

src/utils/withResolvers.ts

@@ -0,0 +1,13 @@
+/**
+ * Polyfill for Promise.withResolvers() (ES2024, Node 22+).
+ * package.json declares "engines": { "node": ">=18.0.0" } so we can't use the native one.
+ */
+export function withResolvers<T>(): PromiseWithResolvers<T> {
+  let resolve!: (value: T | PromiseLike<T>) => void
+  let reject!: (reason?: unknown) => void
+  const promise = new Promise<T>((res, rej) => {
+    resolve = res
+    reject = rej
+  })
+  return { promise, resolve, reject }
+}