Flatten so the repo root is the Arduino sketchbook; the project lives in
WeatherPredictor/. Add a collection index README at the root and move the
detailed project README into WeatherPredictor/.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Scan all samples for the newest one >=3h old instead of assuming
strictly increasing timestamps, so an NTP time correction no longer
breaks trend detection.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>