Algorithms and Search Foundations is still in progress

Start with sorting as visible work on a live list, then reuse the same list language to understand binary search as halving the search space.

This completion page stays public, but the completion reflection only unlocks after every concept and authored checkpoint in this track is clear on this browser. The route still reads the same local concept records and solved challenge ids, and signed-in sync keeps reusing those records instead of inventing a separate track store.