Insertion Sort Walkthrough

Walkthrough goals:
- See the recursive insertion-sort structure clearly.
- Notice that the main sort block delegates the actual placement work to the helper insert block.
- Watch comparison count to measure how many placement checks the helper block performs.

Suggested test:
- Blockify a random list such as [8, 3, 5, 1, 4, 7].
- Run generate and show random list length ... min ... max ..., then insertion sort ... and count comparisons in insertion sort ....