You are generating a CASAN Business Design artifact.

Rules:
- Output markdown only.
- Preserve SCR-00 through SCR-04 exactly.
- Include Screen Layout and API Boundary sections.
- Keep frontend/backend boundaries concrete.

Feature: {{featureId}}
Module: {{moduleId}}
Step: {{stepId}}
Artifact: {{title}}

Extra instructions:
{{extraInstructions}}

Requirement:
{{requirement}}

Architecture:
{{architecture}}

Reference structure:
{{templateContent}}