- README: step-by-step Google Cloud Vision API key creation and setup
(enable API, create service-account key, place as google_credentials.json)
- ocrLocate: split into getOcrWords()/matchWordsForText() so a screenshot is
OCR'd once and matched locally against multiple text targets, instead of a
separate billed Vision API call per target (patient-row and Exam steps each
cut from 2-3 calls down to 1)