Release v7.68.0

Added

• The Screenplay skills explain warning PLAY0690: a reducer instance is always keyed by the event-source id of the events it reduces, so a reducer-backed view looked up by another identity type, or fed by producers with different identity types, is reported. They show the fix (a projection keyed on each from, or a join) and what the check does not compare. (#702)
• The toolchain and modeling-lifecycle skills teach the screenplay.json validation gate at the model root: the standalone screenplay tool and cratis screenplay validate read checks, warnings as errors, scope and open-questions mode from it, --print-gate shows the effective gate, and a refused gate file counts as "could not run". (#691)

Fixed

• The skills no longer say cratis screenplay validate lacks --open-questions; the CLI has it.