Ship the Tech Tools plugin that the previous export silently dropped

plugins/tools/manifest.json

@@ -0,0 +1,11 @@
+{
+  "name": "tools",
+  "version": "1.0.0",
+  "description": "Tech Tools: shop-floor utilities that run entirely in the browser (barcode/QR label generator, with room for more)",
+  "author": "ShopDB Team",
+  "dependencies": [],
+  "core_version": ">=0.16.0,<1.0.0",
+  "provides": {
+    "features": ["code_generator"]
+  }
+}