chore: add deno.json for editor IntelliSense and update README

README.md

@@ -23,4 +23,19 @@ Functions prefixed with `API_` are auto-routed:
 
 ## Environment Variables
 
-- `GREETING_PREFIX` — custom greeting prefix (default: "Hello")
+- `GREETING_PREFIX` — custom greeting prefix (default: "Hello")
+
+## Editor Setup
+
+The `pages/` folder contains a `deno.json` so Deno-aware editors pick up the
+correct globals (`Deno.env`, `Deno.serve`, etc.).
+
+**VS Code:** install the
+[Deno extension](https://marketplace.visualstudio.com/items?itemName=denoland.vscode-deno)
+and enable it for the `pages/` folder (it should pick up `deno.json`
+automatically).
+
+**JetBrains IDEs:** the built-in Deno plugin works the same way.
+
+Without a Deno-aware editor, `Deno.env` will show as an undefined identifier
+— but the code still runs correctly inside the generated container.

pages/deno.json

@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "lib": ["deno.ns", "deno.window", "dom", "esnext"],
+    "strict": true
+  },
+  "lint": {
+    "rules": {
+      "tags": ["recommended"]
+    }
+  },
+  "fmt": {
+    "useTabs": false,
+    "lineWidth": 100,
+    "indentWidth": 2,
+    "semiColons": true,
+    "singleQuote": false
+  }
+}