Add ESLint npm script for source linting (#3)

* Initial plan

* Initial commit - planning changes

Co-authored-by: GochoMugo <[email protected]>

* Add eslint to devDependencies and create test:lint script

Co-authored-by: GochoMugo <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: GochoMugo <[email protected]>

Author: Copilot

eslint.config.js

@@ -0,0 +1,26 @@
+module.exports = [
+    {
+        languageOptions: {
+            ecmaVersion: 2022,
+            sourceType: "commonjs",
+            globals: {
+                console: "readonly",
+                process: "readonly",
+                require: "readonly",
+                module: "readonly",
+                __dirname: "readonly",
+                __filename: "readonly",
+                exports: "readonly",
+                Buffer: "readonly",
+                setTimeout: "readonly",
+                setInterval: "readonly",
+                clearTimeout: "readonly",
+                clearInterval: "readonly",
+            },
+        },
+        rules: {
+            "no-unused-vars": "warn",
+            "no-undef": "error",
+        },
+    },
+];