video-add-adapter

Extend BaseVideoGenerationAdapter and implement getUrl, transformRequest, transformResponse, getVideoDuration, and getEstimatedSKUItems, using existing provider adapters as templates. Then register the adapter enum, factory entry, provider mapping, and pricing strategy, and add tests covering submit, poll states, and SKU calculation.

Return the upstream job ID from submit and classify pending, running, completed, failed, and cancelled states without treating transient poll responses as terminal. Validate and normalize upstream submit, poll, terminal, and artifact responses with Zod schemas.

The serving read path returns null when supported_video_parameters fails schema validation, and video routing treats missing capability lists as compatible with every request. Extend the serving enums in the same adapter PR so staged capability metadata is schema-valid instead of dropping the capability field.

Use extractSoleVideoReference for the single video_url reference, reject generation controls, return null from getVideoDuration at request time, and set duration plus the final SKU from the terminal poll. The black-forest-labs-video-upscale and black-forest-labs-video-edit adapters are the reference models.

Mock globalThis.fetch and cover submit, each poll state, malformed and error responses, artifact fetch, duration and SKU calculation, input references, passthrough filtering, and redacted logs. Run the video-generation package test and typecheck commands before opening the PR.