v1.1.3 — inline date schema (no $ref)
Fix: isoDate is now a factory so zod-to-json-schema no longer dedupes date fields into a $ref (e.g. dateTo → #/properties/dateFrom). The OpenAI Apps schema analyzer doesn't dereference $ref and flagged such fields as any (unclear arguments). Each date field now inlines its own type+pattern. Affects get_statistics (dateFrom/dateTo) and campaign tools (startDate/endDate).