Release v4.18.0

Changed

• Stage now uses Screenplay 4.35.0 and its canonical corpus.
• Reaction trigger reads (Screenplay 4.31) is accepted and adds no runtime behaviour, since Screenplay binds no runtime meaning to it yet. Stage's documentation says so, and that matching children in a child join is left to Chronicle.

Fixed

• A model that declares event generations (Screenplay 4.34) now fails with STAGE-EVENT-001, naming the event, on every path that reads events from syntax, instead of rendering one generation's shape as if it were the current event. (#160)