joeytrasatti-openai e4bc352782 Add ephemeral flag support to thread fork (#14248) ...

### Summary
This PR adds first-class ephemeral support to thread/fork, bringing it
in line with thread/start. The goal is to support one-off completions on
full forked threads without persisting them as normal user-visible
threads.

### Testing

2026-03-10 16:34:27 -07:00

100 KiB

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