chore(repo): initialize planarchy workspace

tooling/eslint/package.json

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+{
+  "name": "@planarchy/eslint-config",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    "./base": "./src/base.js",
+    "./nextjs": "./src/nextjs.js"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "@typescript-eslint/eslint-plugin": "^8.18.0",
+    "@typescript-eslint/parser": "^8.18.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-import": "^2.31.0"
+  },
+  "peerDependencies": {
+    "eslint": "^9.0.0",
+    "typescript": "^5.0.0"
+  }
+}

tooling/eslint/src/base.js

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+import tsPlugin from "@typescript-eslint/eslint-plugin";
+import tsParser from "@typescript-eslint/parser";
+import prettierConfig from "eslint-config-prettier";
+
+/** @type {import("eslint").Linter.FlatConfig[]} */
+export default [
+  {
+    files: ["**/*.{ts,tsx}"],
+    plugins: {
+      "@typescript-eslint": tsPlugin,
+    },
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        project: true,
+      },
+    },
+    rules: {
+      ...tsPlugin.configs["recommended"].rules,
+      "@typescript-eslint/no-unused-vars": ["error", { argsIgnorePattern: "^_" }],
+      "@typescript-eslint/consistent-type-imports": "error",
+      "@typescript-eslint/no-explicit-any": "error",
+      "no-console": ["warn", { allow: ["warn", "error"] }],
+    },
+  },
+  prettierConfig,
+];

tooling/eslint/src/nextjs.js

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+import baseConfig from "./base.js";
+
+/** @type {import("eslint").Linter.FlatConfig[]} */
+export default [
+  ...baseConfig,
+  {
+    rules: {
+      "@typescript-eslint/no-misused-promises": [
+        "error",
+        { checksVoidReturn: { attributes: false } },
+      ],
+    },
+  },
+];