ARCCHR0007 — Command handler must not append directly to the event log

A decorated command’s handle() should return events for the Chronicle integration to append. Direct appends from handle() or provide() to eventLog.append(...) or appendMany(...) (including .transactional) bypass the returned-event batch. The rule recognizes this.store, a local store obtained with await this.runtime.getStore(...), and stores obtained from a @inject(ChronicleReadModels) or @inject(ChronicleRuntime) parameter, both through a local variable and inline await calls. It does not follow helpers, callbacks, or arbitrary stores and does not forbid standalone Arc commands from returning non-event responses.

// Instead of: await this.store.eventLog.append(this.id, new Registered());
return new Registered();

This is an analog of the .NET warning. Transactional commands explains the batch boundary.