Extract typed facts from a conversation block.
Resulting facts have stable IDs of the form
<sessionId>-fact-<index>, where <index> is the sequential
POST-DROP position so dropped facts produce contiguous IDs in the
returned array.
Never throws on extractable input. Catastrophic outer parse
failures (invalid JSON, primitive value, missing facts key) get
one retry; persistent failure returns []. Bad individual facts
are dropped silently via per-fact safeParse.
Full conversation text. Will be wrapped in the user prompt's delimiters automatically.
Stable identifier used to namespace the resulting fact IDs.
Array of TypedFacts, possibly empty.
The 6-step extractor. Stateless aside from its constructor options; safe to share across concurrent extractions.