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feat(ecg): improve P/T wave detection

Dharamveer requested to merge dharmveer-dev into master
  • Expand RR interval limits from 30–200 BPM to 15–300 BPM.
  • Update annotation defaults to support 15–300 BPM.
  • Extend maximum RR interval validation to 5 seconds.
  • Fix P-wave search window calculation and boundary handling.
  • Improve P-wave threshold using adaptive signal amplitude.
  • Pass lead data directly to T-wave end detection.
  • Update T-wave detection with adaptive slope thresholding.
  • Increase T-wave flat-slope validation to 10 samples.
  • Add 500 Hz, 0.5 Hz high-pass filter coefficients.
  • Add filtered ECG data support to validation tests.
  • Add edhr25adia50x2n extraction test and dataset setup.
  • Export ST/QT waveform regions to CSV.

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