Build-an-X workflow that converts user stories into Gherkin scenarios - extracts the actor / capability / value triple from "As a … I want … so that …", maps acceptance criteria to Scenario blocks, identifies parameterizable axes for Scenario Outlines, and emits a Feature file ready for `bdd-step-library-curator`-curated step definitions. Starts from the story itself rather than from an already-extracted acceptance-criteria list; this skill operates at the user-story layer and produces Gherkin directly. Emits Gherkin only: no step definition stubs and no runner detection. For a full runnable artifact (Feature file plus scaffolded step definitions), follow this skill with step-definition scaffolding for the detected runner. Use when a PM hands over a user story or a backlog of stories and the team's first test artifact is the `.feature` file rather than a separate AC doc.