Initial commit: Siege Protocol

Inverted tower-defense browser game — deploy enemies yourself, tower auto-kills them, pocket credits, upgrade weapons. HTML + Canvas + vanilla JS, no build step.

Co-Authored-By: claude-flow <ruv@ruv.net>

js/shop.js

@@ -0,0 +1,24 @@
+// ═══ shop.js ═══
+// ============================================================
+//  SHOP.JS — Shop state management (canvas draws each frame)
+// ============================================================
+
+function openShop() {
+  if (G.gameOver) return;
+  G.shopOpen = true;
+  _shopScrollY = 0;
+  setPaused(true, false);
+}
+
+function closeShop() {
+  G.shopOpen = false;
+  _shopScrollY = 0;
+  setPaused(false);
+}
+
+function setShopTab(tab) {
+  G.shopTab = tab;
+  _shopScrollY = 0;
+}
+
+function renderShop() { /* canvas draws shop each frame via drawShopOverlay() */ }