CXR Second Reader v0.1.0

Initial public research-prototype release. Includes the local FastAPI and Docker demo, the GitHub Pages project site, local-first Jupyter workflows, validation-first evaluation changes, and GitHub quality/container workflows. The Pages URL is a project overview; model inference is not publicly hosted. Previous 24-case ROUGE/BLEU scores are exploratory and do not measure clinical accuracy. Not for clinical use or patient-care decisions; qualified clinician review is required.