Model maintenance: mistral-text #577

Items the Mistral × Text model-maintenance routine has already posted to Discord, one per line: <key> | <first posted> | <fact>.

successor:mistral-medium-3-5 | 2026-11-11 | Chat FLOW id deprecated 2026-10-31, retires 2027-04-30; named replacement mistral-large-4-0 already served as FORGE
shutdown:devstral-medium-latest | 2026-11-11 | Devstral 2 alias past its 2026-07-31 retirement; removal needs a live call (devstral-2512, magistral-small-latest, magistral-medium-latest still serve as of 2026-11-11)