Executed documentation: every example below is a passing test, and every result is captured from a real run. Sequence diagrams, call trees, authority and ownership graphs, all rendered from the witness, not written by hand.
A constant-product AMM: initialize a pool, add liquidity, and the atomic sandwich that proves a locked pool is no boundary against the authority who holds the key.
The SPL Record program: store bytes behind an authority you can hand off. Small and complete, a good first read.
A recurring-payment program: a usage guide by journey (authorities, plans, subscribing, collecting, delegations), every page an executed story with the integration code to match, and the audit findings that now hold as enforcement exhibits.