Transcript units are the only evidence for extracted events and factual claims.
Campaign and registry references may disambiguate names, aliases, speakers, or
other identities, but they do not establish events, participation, effects, or
source evidence.

Every reported factual claim must be supported by cited transcript units. Use
integer `start_unit_id` and `end_unit_id` values from the transcript. Omit
`source_id`; Notarius assigns the current source identity.

When supporting evidence is non-contiguous, use multiple narrow ranges rather
than a broad range that bridges unrelated conversation.

Return exactly one JSON object and no explanatory text. Output only the
configured JSON object and fields defined by its response schema.