Function compare_snapshot_signal_drift 

pub fn compare_snapshot_signal_drift(
    baseline: &NormalizedFingerprintSnapshot,
    candidate: &NormalizedFingerprintSnapshot,
    options: &SnapshotDeterminismOptions,
) -> Result<SnapshotDriftReport, SnapshotCollectionError>

Compare baseline and candidate snapshots for deterministic, signal-focused drift.

The comparison validates both snapshots, applies deterministic normalization, and reports only differences under the signals subtree.

Errors

Returns SnapshotCollectionError when either snapshot fails compatibility validation or deterministic serialization.