Function export_path_sanity_decisions 

pub fn export_path_sanity_decisions<P: AsRef<Path>>(
    debug_info: &DebugInfo,
    output_path: P,
) -> Result<(), ProjectionError>

Export Phase 5 — Post-Viterbi path sanity decisions as GeoJSON

Produces a FeatureCollection with one Point feature per consecutive segment pair evaluated during navigability validation. Each feature is placed at the midpoint of the from-netelement’s geometry.

Properties per feature:

• pair_index — sequential index of the pair (0-based)
• from_netelement_id — source netelement
• to_netelement_id — target netelement
• reachable — whether the target was reachable
• action — “kept”, “removed”, or “rerouted”
• rerouted_via — comma-separated NE IDs of bridge segments (empty if N/A)
• warning — warning message (empty if reachable)