Function compare_traces 

pub fn compare_traces(
    log: &[(f64, f64)],
    hpr: &[(f64, f64)],
    hpr_apogee_s: f64,
) -> Result<TraceComparison, String>

The ascent of hpr (time since ignition, height) against the log’s, each aligned where it first reaches ALIGN_HEIGHT_M, over the log’s rows from there to the first of the two apogees.

hpr_apogee_s is hpr’s apogee time from its own event, since its grid may miss the top.

Errors

A message when a trace never reaches the alignment height or no row falls in the window.