reflection turn is a meta-turn for editing the learnings file; the
task's `result` output was already finalized on the previous turn.
gemini pro re-triggers on the standing "call set_output when done"
system instruction during reflection and clobbers the value with the
literal word "done" (see ci run 26529624199, smoke test on
providers-live google/gemini-pro). add an explicit prohibition to the
reflection prompt; the snapshot/restore in runPostRunRetryLoop
remains as defense in depth.
Colin McDonnell
b49c1d9a57