docs: add patient registration source and special admission type articles - New: Patient-Registration-Source.md — PatientRegistrationSource enum, trust hierarchy, display locations, admin notes - New: On-Admission-Death.md — OAD workflow, dual-write rule (new vs existing patient), badges - New: Rapid-Temporary-AE-Admission.md — temp A&E workflow, complete-registration flow, de-duplication via Change Patient - Updated: Add-new-patient.md — added Registration Source section and cross-links - Updated: Admit-a-Patient.md — added special admission types section and Registration Source note

buddhika75 committed Jun 3, 2026