docs(generic_guardrail_api): document fire_and_forget

[caduri]

Documents the new fire_and_forget and fire_and_forget_max_inflight options for the generic guardrail API, added in BerriAI/litellm#43681. Please merge it only after that PR ships

The page gains both options in the LiteLLM Configuration example and a short "Fire and forget" section with a warning that the guardrail becomes observe-only and can no longer block. The section explains how dispatched calls are recorded (success, so they count as passes in the usage dashboard and compliance checks), that background failures are only logged, that a stream is checked once when it closes, including one the client hangs up on, the per-worker in-flight cap and its not_run drops, the background timeout, and what an invalid value does

npm run build, npm run lint:writing and npm run lint:docs all pass locally

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Project	Deployment	Actions	Updated
litellm	Ready	Preview	Oct 3, 2026 1:48pm UTC