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/array.ts

@@ -0,0 +1,13 @@
+export function intersperse<A>(as: A[], separator: (index: number) => A): A[] {
+  return as.flatMap((a, i) => (i ? [separator(i), a] : [a]))
+}
+
+export function count<T>(arr: readonly T[], pred: (x: T) => unknown): number {
+  let n = 0
+  for (const x of arr) n += +!!pred(x)
+  return n
+}
+
+export function uniq<T>(xs: Iterable<T>): T[] {
+  return [...new Set(xs)]
+}