雷电芽衣
00a5e318bb
The slug-match step treated an entry whose api_backend equals the default as unset and overwrote it with a same-slug sibling's backend, so `api_backend = "chat_completions"` silently became messages/responses. Config keys whose override sets api_backend are recorded and skipped by the donor step; an unset backend still inherits. Ported from upstream 1.0.22 (grok-build agent/config.rs explicit_api_backend_keys). Claude-Session: https://claude.ai/code/session_01RUqV8HVGXcAETyYbZ2tPQ4