feat: module interaction system with wiring panel

Add a new "module" interaction type where doors/devices define ports
(in/out) and a JS verify function. Players wire their gadget's I/O
to the module's ports via a canvas-rendered wiring panel, then execute
to verify the circuit logic.

- New wiringPanel.js: full wiring UI with keyboard nav, bezier wires,
  mini circuit evaluator, and verify execution
- AND-gate example door in Circuit Lab (tile 9,1)
- Editor support: module type with ports editor and JS verify textarea
- Integrated into gameMode, worldInput, worldRenderer

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

js/world/gameMode.js

@@ -4,6 +4,7 @@ import { initWorldRenderer, startWorldLoop, stopWorldLoop } from './worldRendere
 import { initWorldInput, destroyWorldInput, setInteractionHandler } from './worldInput.js';
 import { getMap } from './maps.js';
 import { saveGadget, openBackpack, getGadgets, openNamingScreen, showNotification } from './inventory.js';
+import { openWiringPanel } from './wiringPanel.js';
 
 // Circuit editor stop function (to stop its render loop when switching modes)
 import { stopCircuitLoop } from '../renderer.js';
@@ -144,6 +145,31 @@ function handleInteraction(event) {
             break;
         }
 
+        case 'module': {
+            const inter = event.data;
+            // Already solved?
+            if (inter.moduleId && isPuzzleSolved(inter.moduleId)) {
+                startDialog(['This module is already unlocked.'], 'System');
+                return;
+            }
+            // Need gadgets
+            const mGadgets = getGadgets();
+            if (mGadgets.length === 0) {
+                const portDesc = (inter.ports || []).map(p => `${p.name} (${p.dir})`).join(', ');
+                startDialog([
+                    `This module requires a gadget to operate.`,
+                    `Ports: ${portDesc}`,
+                    'Craft a circuit in your Workshop (TAB) and save it as a gadget!'
+                ], 'System');
+                return;
+            }
+            // Open backpack → on "Use", open wiring panel
+            openBackpack((gadget) => {
+                openWiringPanel(inter, gadget);
+            });
+            break;
+        }
+
         case 'openInventory':
             // TODO: inventory UI
             console.log('[gameMode] inventory:', worldState.inventory);