add various direction examples

examples/05_orientation_stress.py

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+from inire.geometry.collision import CollisionEngine
+from inire.geometry.primitives import Port
+from inire.router.astar import AStarRouter
+from inire.router.cost import CostEvaluator
+from inire.router.danger_map import DangerMap
+from inire.router.pathfinder import PathFinder
+from inire.utils.visualization import plot_routing_results
+
+
+def main() -> None:
+    print("Running Example 05: Orientation Stress Test...")
+
+    # 1. Setup Environment
+    # Give some breathing room (-20 to 120) for U-turns and flips (R=10)
+    bounds = (-20, -20, 120, 120)
+    engine = CollisionEngine(clearance=2.0)
+    danger_map = DangerMap(bounds=bounds)
+    danger_map.precompute([])
+    
+    evaluator = CostEvaluator(engine, danger_map, greedy_h_weight=1.1)
+    router = AStarRouter(evaluator, node_limit=100000)
+    pf = PathFinder(router, evaluator)
+    
+    # 2. Define Netlist with various orientation challenges
+    netlist = {
+        # Opposite directions: requires two 90-degree bends to flip orientation
+        "opposite": (Port(10, 80, 0), Port(90, 80, 180)),
+        
+        # 90-degree turn: standard L-shape
+        "turn_90": (Port(10, 60, 0), Port(40, 90, 90)),
+        
+        # Output behind input: requires a full U-turn
+        "behind": (Port(80, 40, 0), Port(20, 40, 0)),
+        
+        # Sharp return: output is behind and oriented towards the input
+        "return_loop": (Port(80, 20, 0), Port(40, 10, 180)),
+    }
+    net_widths = {nid: 2.0 for nid in netlist}
+
+    # 3. Route
+    results = pf.route_all(netlist, net_widths)
+
+    # 4. Check Results
+    for nid, res in results.items():
+        status = "Success" if res.is_valid else "Failed"
+        total_len = sum(comp.length for comp in res.path) if res.path else 0
+        print(f"  {nid:12}: {status}, total_length={total_len:.1f}")
+
+    # 5. Visualize
+    fig, ax = plot_routing_results(results, [], bounds, netlist=netlist)
+    fig.savefig("examples/orientation_stress.png")
+    print("Saved plot to examples/orientation_stress.png")
+
+
+if __name__ == "__main__":
+    main()