feat(ci): onboard vitest-runner onto CLDMV v4 release flow

.configs/.prettierrc

@@ -0,0 +1,16 @@
+{
+	"useTabs": true,
+	"tabWidth": 2,
+	"printWidth": 140,
+	"trailingComma": "none",
+	"quoteProps": "preserve",
+	"bracketSpacing": true,
+	"overrides": [
+		{
+			"files": "*.md",
+			"options": {
+				"proseWrap": "preserve"
+			}
+		}
+	]
+}

.configs/eslint.config.mjs

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+/**
+ * @fileoverview ESLint flat configuration for @cldmv/vitest-runner.
+ * @module vitest-runner/.configs/eslint.config
+ *
+ * @description
+ * Mirrors the CLDMV @cldmv/slothlet lint setup: `@eslint/js` recommended for
+ * JS/MJS/CJS sources (with the `_` / `___` unused-binding escape hatch), plus
+ * the JSON and Markdown language plugins. (slothlet's CSS plugin is omitted —
+ * this repo has no CSS.) Run via `npm run lint`.
+ */
+
+import js from "@eslint/js";
+import globals from "globals";
+import json from "@eslint/json";
+import markdown from "@eslint/markdown";
+import { defineConfig } from "eslint/config";
+
+export default defineConfig([
+	// Global ignores — applies to all configurations
+	{
+		ignores: [
+			"tmp/**",
+			"trash/**",
+			"node_modules/**",
+			"dist/**",
+			"build/**",
+			".git/**",
+			".configs/**",
+			".vscode/**",
+			"coverage/**",
+			"types/**",
+			// Untracked local copy of the original monolithic runner — kept for reference, not maintained.
+			"reference/**",
+			".vitest-coverage-tmp/**",
+			".vitest-coverage-blobs/**",
+			"*.min.js",
+			"*.min.css",
+			"**/package-lock.json",
+			// Copy file patterns
+			"*copy/",
+			"*copy (*)/",
+			"*copy */",
+			"*copy.*",
+			"*copy (*).*",
+			"*copy *.*",
+			// Additional copy patterns for nested directories
+			"**/*copy/",
+			"**/*copy (*)/",
+			"**/*copy */",
+			"**/*copy.*",
+			"**/*copy (*).*",
+			"**/*copy *.*"
+		]
+	},
+	{
+		files: ["**/*.{js,mjs,cjs}"],
+		plugins: { js },
+		extends: ["js/recommended"],
+		rules: {
+			"no-unused-vars": [
+				"error",
+				{
+					argsIgnorePattern: "^(_|___.*)$",
+					caughtErrorsIgnorePattern: "^(_|___.*)$",
+					destructuredArrayIgnorePattern: "^(_|___.*)$",
+					varsIgnorePattern: "^(_|___.*)$"
+				}
+			]
+		}
+	},
+	{ files: ["**/*.cjs"], languageOptions: { sourceType: "commonjs" } },
+	{ files: ["**/*.{js,mjs,cjs}"], languageOptions: { globals: { ...globals.node, ...globals.browser } } },
+	{
+		files: ["tests/**/*.{js,mjs,cjs}"],
+		languageOptions: {
+			globals: {
+				beforeAll: true,
+				afterAll: true,
+				beforeEach: true,
+				afterEach: true,
+				describe: true,
+				it: true,
+				expect: true,
+				test: true,
+				vi: true
+			}
+		}
+	},
+	{ files: ["**/*.json"], plugins: { json }, language: "json/json", extends: ["json/recommended"] },
+	{ files: ["**/*.jsonc"], plugins: { json }, language: "json/jsonc", extends: ["json/recommended"] },
+	{ files: ["**/*.json5"], plugins: { json }, language: "json/json5", extends: ["json/recommended"] },
+	{
+		files: ["**/*.md"],
+		plugins: { markdown },
+		language: "markdown/gfm",
+		extends: ["markdown/recommended"],
+		rules: {
+			// GitHub alerts like [!NOTE] / [!WARNING] are valid GFM but trip the label-ref check.
+			"markdown/no-missing-label-refs": "off"
+		}
+	}
+]);