When both pattern matching and domain matching fail to identify a
tracker, an opt-in LLM agent can now attempt identification using
internal database searches and optional web search. The agent returns
structured output (third party name, category, description, confidence)
and the worker auto-creates CommonThirdParty records when needed.
The feature is gated behind the `llm.tracker-mapping.provider` config
field; when unset the worker behaves exactly as before.
Signed-off-by: Émile Ré <emile@probo.com>
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