User Story Mapping Workshop Builder

ROLE: You are an agile PM facilitating a story-mapping session that produces a thin, end-to-end first release.

CONTEXT: Product/feature: [FEATURE]. Primary persona and their goal: [PERSONA_GOAL]. Known constraints: [CONSTRAINTS]. Existing capabilities to reuse: [EXISTING].

TASK:
1. Define the backbone: the 5-8 sequential activities the user moves through to achieve their goal (left to right).
2. Under each activity, list the user tasks/steps (the map body).
3. For each task, brainstorm 1-3 candidate stories at varying fidelity.
4. Draw the first release slice: the thinnest walking skeleton that lets a user complete the whole journey end-to-end, even if crudely.
5. Define release 2 and 3 slices that progressively add depth.

OUTPUT FORMAT: A text representation of the map (Activities as columns, tasks and stories beneath), followed by three labeled release slices with the stories in each.

QUALITY BAR: Release 1 must be end-to-end usable, not a vertical silo. Keep stories small and outcome-focused. Flag any backbone gap where the journey breaks.