Add Delete/Backspace shortcut to remove the selected piece

DetailPanel exposes the currently-shown piece id; Main's key handler
delegates Delete or Backspace to the same path as the Retirer button
when a piece is selected. Harness gains "delete" under key() so UI
tests can exercise the shortcut directly.

Scripts/Automation/AutomationFacade.cs

@@ -30,6 +30,7 @@ internal class AutomationFacade
     public Action QuickSave { get; }
     public Action QuickLoad { get; }
     public Action Undo { get; }
+    public Action DeleteSelected { get; }
 
     public AutomationFacade(
         Func<GameSim?> sim,
@@ -47,7 +48,8 @@ internal class AutomationFacade
         Action quit,
         Action quickSave,
         Action quickLoad,
-        Action undo)
+        Action undo,
+        Action deleteSelected)
     {
         Sim = sim;
         Input = input;
@@ -65,5 +67,6 @@ internal class AutomationFacade
         QuickSave = quickSave;
         QuickLoad = quickLoad;
         Undo = undo;
+        DeleteSelected = deleteSelected;
     }
 }

Scripts/Automation/CommandDispatcher.cs

@@ -154,6 +154,10 @@ internal class CommandDispatcher
             case "esc":
                 _facade.Input.Cancel();
                 break;
+            case "delete":
+            case "del":
+                _facade.DeleteSelected();
+                break;
             default:
                 throw new InvalidOperationException($"Unsupported key: {key}");
         }

Scripts/Main.cs

@@ -111,7 +111,8 @@ public partial class Main : Node2D
 			quit: () => GetTree().Quit(),
 			quickSave: OnQuickSave,
 			quickLoad: OnQuickLoad,
-			undo: OnUndo);
+			undo: OnUndo,
+			deleteSelected: OnDeleteSelected);
 
 		_automationHarness = new AutomationHarness(dir, facade);
 		AddChild(_automationHarness);
@@ -207,6 +208,12 @@ public partial class Main : Node2D
 				OnUndo();
 				GetViewport().SetInputAsHandled();
 			}
+			else if ((key.Keycode == Key.Delete || key.Keycode == Key.Backspace)
+				&& _detailPanel.CurrentPieceId is int pid)
+			{
+				OnRemoveRequested(pid);
+				GetViewport().SetInputAsHandled();
+			}
 		}
 	}
 
@@ -894,6 +901,12 @@ public partial class Main : Node2D
 		}
 	}
 
+	private void OnDeleteSelected()
+	{
+		if (_detailPanel.CurrentPieceId is int pid)
+			OnRemoveRequested(pid);
+	}
+
 	private void OnCollisionOccurred(int col, int row, string victimKind, int destroyerId)
 	{
 		if (_sim == null) return;

Scripts/UI/DetailPanel.cs

@@ -79,4 +79,6 @@ public partial class DetailPanel : PanelContainer
     }
 
     public new void Hide() => Visible = false;
+
+    public int? CurrentPieceId => Visible ? _currentPieceId : null;
 }

docs/PLAN.md

@@ -12,13 +12,6 @@ et l'extension de la campagne.
 Le moteur expose deja les commandes et events requis ; cote Godot il manque
 les surfaces d'interaction et d'animation.
 
-### 1.3 Collision — camera pan/zoom + notification
-L'engine emet deja `PieceReturnedToStockEvent` + auto-pause. Il reste a :
-- Animer un pan + zoom de la camera vers la case de collision.
-- Afficher une notification dans un coin de l'ecran
-  (ex : "Tour II detruite par Dame — retournee au stock").
-- Reprise a Espace apres lecture.
-
 ### 1.4 Touche Suppr pour retirer une piece
 Le bouton `[Retirer]` du `DetailPanel` existe. Ajouter en complement :
 selection + `Delete` → meme effet que le bouton.

tools/automation/test_delete_key.py

@@ -0,0 +1,30 @@
+"""Smoke test for Delete key removing a selected piece."""
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[2]))
+
+from tools.automation.harness import Harness
+
+
+def main():
+    with Harness.launch(run_name="delete_key") as h:
+        h.load_mission("campaign_01", 0)
+        h.place("Pawn", (0, 0), (0, 1))
+
+        # Select the piece by clicking its start cell
+        h.click_cell(0, 0)
+        h.screenshot("01_selected")
+        assert len(h.state()['pieces']) == 1
+
+        # Press Delete
+        h.key("delete")
+        h.screenshot("02_deleted")
+        s = h.state()
+        assert len(s['pieces']) == 0, "Piece should be removed"
+        assert s['remainingStock']['Pawn'] == 4, "Stock should be replenished"
+        print("OK — Delete key removes the selected piece")
+
+
+if __name__ == "__main__":
+    main()