Called by the inline Script Builder tab on Submit. Writes
ai_drafted_script + ai_drafted_parameters to the fix without stamping
applied_at (a draft is not an application — that's §5 of the Phase 9
spec). Bumps state_version so Resolve/Escalate preview bundles
regenerate.
409 on terminal fix status. 404 on wrong session. 422 on empty script.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
