chore: Enforce a few house rules via eslint (#2539)

src/utils/sleep.ts

@@ -1,4 +1,6 @@
 // Usage of this function needs to be justified with a comment.
 export const sleep = async (seconds: number) => {
+  // This is the low-level delay primitive callers reach for instead of a raw timer.
+  // eslint-disable-next-line no-restricted-syntax
   await new Promise((r) => setTimeout(r, seconds * 1000));
 };