Patient Visit Summary Printing for OpenMRS O3

OpenMRS lacks a printable visit summary, forcing patients to verbally relay medical history during referrals and care transitions. This project adds a Visit Summary PDF generator to the existing openmrs-module-patientdocuments module, reusing the proven Patient ID Sticker pipeline (DataSetEvaluator, XML Renderer, Apache FOP). The backend gathers visit-scoped clinical data (vitals, diagnoses, lab results with reference ranges, allergies, medications, visit notes) via batch queries, renders it as XML, and transforms it to PDF through XSLT. An extensible VisitSummarySectionProvider SPI allows any module (billing, appointments, pharmacy) to contribute sections without modifying the core module. Configuration uses deploy-time Initializer keys for section toggles, concept UUIDs, and page sizes (A4/A5/A6). The frontend adds a print button in the O3 visit-detail-overview-actions slot with iframe-based PDF preview and download fallback. Deliverables include the complete backend pipeline with all clinical sections, extensible SPI architecture, configurable XSLT stylesheet, REST endpoint with privilege enforcement, frontend print extension, comprehensive tests, and documentation.