Generate content with a single API call.
template_id and user_direction:
content_id in the response. Use this ID for all downstream operations (retrieve, edit, finalize).
content_id:
API key (dl_live_...) or Supabase JWT token
Content ID to generate against. If omitted, a new content record is auto-created.
Optional mode flag; set to "sync" only for explicit admin-approved synchronous generation.
Optional override for the generation process name.
Optional override for the generation process version (>=1).
Reasoning controls for GPT-5.
Text output controls for GPT‑5.
Upper bound for visible + reasoning tokens