Track when executor calls cross an upstream transport boundary and use that
signal to keep model/provider errors from being replaced by later local
preparation, selection, or internal failures.
Mark HTTP, websocket, relay, and usage-tracked transports as upstream
attempts, while avoiding marks for local validation, logging, missing
sessions, and successful websocket handshakes before request send.
Parse relative auth expiry metadata and adjust Antigravity refresh timing.
Ensure all Gemini and Gemini Vertex execution and token count pathways invoke SanitizeGeminiRequestThoughtSignatures before dispatching upstream requests. This prevents raw non-Gemini (e.g. Claude CAIS) thought signatures from leaking to upstream Gemini endpoints while preserving valid native protobuf signatures and setting appropriate validator bypass sentinels for function calls.
Co-authored-by: W ARELIK <warelik@WARELIK-MB.local>
