Requesty (added in #474) is an OpenAI-compatible gateway whose capabilities
were a copy of OpenRouter's: same provider/model naming, same
extra_body.reasoning opt-in, no adapter code of its own. Built-in slots are
kept for providers with their own behaviour; a gateway that speaks an
existing wire format is configured through that provider, and #1532 (API
Route) is being closed on the same grounds.
Migration, identical request shape: LANGCHAIN_PROVIDER=openrouter,
OPENROUTER_BASE_URL=https://router.requesty.ai/v1, OPENROUTER_API_KEY=<the
Requesty key>. Past news and contributor credits in the READMEs are left
as history; the supported-provider lists drop it.