Reject SDK body overrides before counting faithful shadow attempts

A shadow inference wrapper that copies selected keyword arguments must account for the SDK's effective wire body. OpenAI SDK extra_body can override normal input or insert continuation state after the wrapper's inspection. Silently dropping that override can produce a successful candidate response to a different request, corrupting coverage and stability interpretation. Normalize the effective body safely, or conservatively reject overrides and unknown inference fields with a distinct skip counter. Remove SDK omission sentinels before serialization, and distinguish intentional transport or identity omissions from unsupported inference settings. This establishes request admission, not live endpoint compatibility or latency isolation.

Applies when: Mirroring OpenAI SDK inference through a keyword-filtering wrapper. Keywords: OpenAI SDK shadow inference extra_body continuation payload coverage admission