build_generation_request flattened the serve config's default_request with
explicit_request_updates, merged the request body into the flat dict, and then
rebuilt a nested GenerationRequest through legacy_generate_call_to_request,
the generate_video keyword mapping. It now builds the nested request directly:
- default_request contributes its explicit fields with their sections, through
the new compat.explicit_request_raw;
- each value collected from the OpenAI request goes to a fixed typed path from
_REQUEST_PATHS, and any other collected value goes to extensions.
The resulting SamplingParam is unchanged. A request-body field still wins over
the same-named field in default_request.stage_overrides, because
request_to_sampling_param applies stage overrides to sampling fields of the same
name. The only difference in the typed request: an operator stage override
that the body does not set now stays under stage_overrides instead of moving
into sampling.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012M91wnVFmPEvJ9h39r5BH7
