Add session forking to codex exec - #37367
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## What changed - Add `codex exec fork <SESSION_ID> [PROMPT]` for creating a new thread from an existing session ID or thread name. - Allow creating the fork without starting a turn, or immediately continue it with a prompt and optional images. - Preserve the source thread ID in the emitted session configuration while leaving the source session unchanged. ## Testing - Add CLI parsing coverage and an end-to-end test for promptless and prompted forks, thread naming, copied history, and unsupported promptless options. GitOrigin-RevId: b8f28b238a1526cc486c5beb886a63f68b8e7986
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Add session forking to
codex execWhat changed
codex exec fork <SESSION_ID> [PROMPT]for creating a new thread froman existing session ID or thread name.
with a prompt and optional images.
leaving the source session unchanged.
Testing
forks, thread naming, copied history, and unsupported promptless options.