Use the product-discovery Skill.

Our team wants to improve the return experience. Connect the supplied interviews and discovery evidence to an opportunity tree, identify desirability, viability, usability and feasibility risks, and prioritize assumptions. Compare the supplied experiment observations with their decision thresholds, propose a prototype and recommend continue, pivot or stop.

The attached business materials are:
- inputs/brief.csv
- inputs/evidence.json
- inputs/merchant.json

Deliver a complete result.md report that the operations team can read, plus any finished files needed for this task. Keep supporting calculations and evidence with the deliverables. Write the report in English; use the requested target language for customer-facing copy. The business datasets are fictional examples unless the brief explicitly names a live public website.