Release v7.56.0

Added

• The Stage sandbox skill describes an optional behavior walk after V3: a domain expert walks each persona's commands and screens on Stage's semantic engine and records what changes, producing findings for the model owner (actions that change nothing visible, screens nothing feeds, work queues that never empty, refusals the model lacks) without changing code or the model. (#682)
• The legacy-extraction skill explains when Arc's Screenplay generator states literal-row specifications as one case table and why it otherwise reports SP0076. Requires Arc.Screenplay 22.99.0. (#707)