Use team handles that exist

Use team handles that exist @axelerant/platform-team was invented. So was @axelerant/engineering. Teams here are named after the repository, -admins and -writers, and there is no central engineering or platform team to fall back on. The sample is a fictional service called dispatch, so it and the examples that mirror it now use @axelerant/dispatch-admins. A reader copying the example gets a name shaped like a real one instead of one that has never existed. The contract now says the convention, and says why a wrong handle is quiet: GitHub ignores an owner it does not recognise, so the path ends up with no required reviewer and no error. The checker validates the shape of a handle and cannot tell whether the team resolves. Co-Authored-By: Claude Opus 5 (1M context) Claude-Session: https://claude.ai/code/session_01XmzqahsmAXBn5wJab92jP2