Submits a free-form question and blocks until the synthesized
answer is ready (hard ceiling 240s). Returns the answer plus
a basis[] array of field-level reasoning and citations.
SAN-issued API key (sk_…) issued from the SAN Agents Dashboard
(Settings → API Keys). Used by every /api/v1/* endpoint; usage
is billed in credits against the owning account's active Stripe
subscription.
The free-form question to answer.
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