Nettoyage des processus PDAL orphelins à l'interruption

Ajout de signal handlers (SIGINT/SIGTERM) et atexit pour tuer
les processus pdal orphelins quand le pipeline est interrompu
ou se termine. Utilise pkill -f pdal pour nettoyer.

lidar_pipeline/cli.py

@@ -5,6 +5,8 @@ Handles argument parsing, logging configuration, and entry point.
 
 import argparse
 import logging
+import os
+import signal
 import sys
 
 from .pipeline import LidarArchaeoPipeline
@@ -145,6 +147,12 @@ Exemples:
     logger.info("Pipeline LiDAR Archéologique")
     logger.info("=" * 60)
 
+    # Kill orphan PDAL processes on interrupt or termination
+    signal.signal(signal.SIGINT, _kill_orphan_pdal)
+    signal.signal(signal.SIGTERM, _kill_orphan_pdal)
+    import atexit
+    atexit.register(_kill_orphan_pdal)
+
     log_gpu_status()
 
     try:
@@ -191,4 +199,21 @@ Exemples:
             pipeline.process_all()
     except Exception as e:
         logger.error(f"Erreur fatale: {e}", exc_info=True)
-        sys.exit(1)
+        sys.exit(1)
+
+
+def _kill_orphan_pdal(signum=None, frame=None):
+    """Kill orphan PDAL processes on interrupt or exit."""
+    import subprocess
+    try:
+        subprocess.run(["pkill", "-f", "pdal"], capture_output=True, timeout=5)
+    except Exception:
+        pass
+    if signum is not None:
+        logger.info("Interruption — nettoyage des processus PDAL")
+        sys.exit(130)
+
+
+def main():
+    """Entry point for the LiDAR archaeological pipeline."""
+    parser = argparse.ArgumentParser(