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feat(respiration): add zero-crossing respiration rate estimation

Dharamveer requested to merge dharmveer-dev into master
  • Implement hysteresis-based zero-crossing respiration rate detection
  • Add DC offset compensation and valid period filtering
  • Add respiration rate smoothing and physiological range validation
  • Integrate zero-crossing estimation into Respiration::Process()
  • Add unit tests for multiple BPM rates, noise, offsets, amplitudes, hysteresis, invalid signals, repeatability, and output validation
  • Add dataset-based respiration rate validation and CSV comparison output

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