VS-09 Export Vertical Slice (CSV/PDF Premium Gate) #45

What to build

Enable PDF export only of a zone's analysis (score + sub-scores + history), generated server-side via POST /v1/zones/export/pdf (backend) — not client-side rendering. CSV and PNG are out of scope (not decided/confirmed). Free users should receive a clear upgrade pathway while premium users can complete export successfully with basic success and failure feedback.

Acceptance criteria

• Premium users can request a PDF export via POST /v1/zones/export/pdf and receive a downloadable file
• Free users are blocked from export with clear call-to-action
• Export loading, success, and failure feedback is visible
• Export behavior is tested for both free and premium roles
• No CSV or PNG export is built as part of this slice

Blocked by

VS-08 Analysis Vertical Slice v1 (One Chart + Filter + Quota Display)