The CLI now submits gateway-compatible first/final-frame payloads, so the server accepts the same public SkillHub schema fields, normalizes them to images[0]/images[1] with metadata.action=firstTailGenerate, and routes multi-frame Vidu-style submissions through the unified video generations endpoint.
Constraint: Align server behavior with popiartcli v0.3.21 start/end-frame payloads
Constraint: Keep existing single-image image2video and MiniMax paths compatible
Rejected: Hardcode only the new fields in server seed skills | loading SkillHub input_schema.json keeps the remote catalog as the source of truth
Confidence: medium
Scope-risk: moderate
Directive: Preserve first-frame then final-frame ordering when changing video reference handling
Tested: go test ./...
Tested: make build
Tested: GOOS=linux GOARCH=amd64 go build -o dist/popiartserver-linux-amd64 ./cmd/popiartserver
Not-tested: Live test-server deployment; current SSH key is rejected by 101.42.99.35
wtgoku
