Function incident_bundle 

pub fn incident_bundle(
    out: &Path,
    spec_path: &Path,
    config_path: Option<&Path>,
    ring_path: Option<&Path>,
) -> Result<(), String>

Export an incident bundle directory.

Bundle contents:

• spec.kv
• spec_validation.json
• runtime.json
• runtime_config.txt (optional)
• environment.json
• single_ring_snapshot.json (optional for SingleRing specs)
• lane_graph_state.json (best-effort for LaneGraph specs)