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Extract insurance certificate information directly from the document images using vision.
insured_name must be the PERSON name of the physician/medic (beneficiary), NOT the institution or practice name.
Return ONLY a valid JSON object with: insured_name, insurance_company, policy_number, coverages (array of UNIQUE coverage types only, one per type - no duplicates), effective_date, expiration_date, is_signed (boolean). For limits use integers 0-999999999 only (e.g. 1000000 for $1M). No scientific notation or decimals. No other text or markdown.