Fix: skip pockets crossing sandbox boundary

profile_assembly.py now checks each pocket's polyline against the plate
boundary using Shapely contains(). Pockets extending outside are dropped.
Sandbox 1: 1 pocket removed (was crossing corner near x=150, y=-20).

tools/adaptive-isogrid/src/brain/profile_assembly.py

@@ -88,13 +88,26 @@ def profile_to_json(ribbed_plate, pockets, geometry, params):
     else:
         outer = [list(p) for p in outer]
 
-    # Structured pocket data (lines + arcs)
+    # Structured pocket data (lines + arcs) — only include pockets fully inside boundary
+    plate = Polygon(outer)
     pocket_data = []
+    skipped = 0
     for p in pockets:
+        # Use polyline to check containment
+        polyline = p.get('polyline', [])
+        if polyline:
+            pocket_poly = Polygon(polyline)
+            if pocket_poly.is_valid and not pocket_poly.is_empty:
+                if not plate.contains(pocket_poly):
+                    skipped += 1
+                    continue
         pocket_data.append({
             'lines': p['lines'],
             'arcs': p['arcs'],
         })
+    if skipped > 0:
+        import sys
+        print(f"[profile_assembly] Skipped {skipped} pockets outside boundary", file=sys.stderr)
 
     # Hole data for NX (circles)
     hole_data = []