End-to-end procedure for shipping a change to the Petrinaut packages (libs/@hashintel/petrinaut, petrinaut-core, petrinaut-cli, apps/petrinaut-opt, apps/petrinaut-website): the verification gates per package, the changeset step, docs sync, pre-PR hygiene checks, and CI expectations from draft to ready. Use when implementing any change in these packages, when creating a PR for Petrinaut work, when running tests or lints for them, or when checking CI on a Petrinaut PR.