- upload<T>(url:method:form:pathParams:headers:debug:timeoutInterval:networkServiceType:)
serialises MultipartForm to a temp file, streams it via uploadTask(with:fromFile:)
bridged to async (works on iOS 13+, unlike URLSession.upload(for:fromFile:))
- temp body file always removed via defer (success and throw)
- move requestLOG/responseLOG to LCEssentials+API+Logging.swift; extract
logResponseError helper; keeps API file at 473 lines
- APIUploadTests: 4 cases
- progress-reporting overload deferred (no stub seam for didSendBodyData)
