Portal's aggregate state machines used to be compiled Rust, duplicated
across four files plus the bucket-name wiring that dispatched to them.
This is now the single source of truth for what states exist, what
event-type string represents each, and what transitions are legal -
portal loads and validates it at boot/reload (see the paired portal
change). Adding a new aggregate, or reshaping an existing one, is now
a content-only change.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
