Add linter and dependabot configs

Author: danbarr

.github/dependabot.yaml

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+version: 2
+updates:
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    groups:
+      docusaurus:
+        patterns:
+          - '*docusaurus*'
+      linters:
+        patterns:
+          - '*lint*'
+          - 'globals'
+          - 'husky'
+          - 'prettier'
+      react:
+        patterns:
+          - 'react'
+          - 'react-dom'
+          - '@types/react'
+          - '@types/react-dom'
+    ignore:
+      # Pin key docusaurus dependencies to major versions
+      - dependency-name: 'react'
+        update-types: ['version-update:semver-major']
+      - dependency-name: '@mdx-js/react'
+        update-types: ['version-update:semver-major']
+      - dependency-name: 'prism-react-renderer'
+        update-types: ['version-update:semver-major']
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.husky/pre-commit

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+npx lint-staged

.lintstagedrc

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+{
+  "*.{js,jsx,ts,tsx,mjs,cjs,mdx}": ["npx prettier --write", "npx eslint --fix"],
+  "*.md": ["npx prettier --write", "npx markdownlint-cli2 --fix"],
+  "*.{css,json,jsonc,yaml,yml}": ["npx prettier --write"]
+}

.markdownlint-cli2.jsonc

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+{
+  "gitignore": true,
+  "globs": ["**/*.md"],
+  "ignores": ["docs/toolhive/reference/cli/"],
+}

.markdownlint.json

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+{
+  "code-block-style": {
+    "style": "fenced"
+  },
+  "code-fence-style": {
+    "style": "backtick"
+  },
+  "emphasis-style": {
+    "style": "underscore"
+  },
+  "heading-style": {
+    "style": "atx"
+  },
+  "hr-style": {
+    "style": "---"
+  },
+  "line-length": {
+    "code_blocks": false,
+    "line_length": 80,
+    "tables": false
+  },
+  "no-bare-urls": false,
+  "proper-names": {
+    "code_blocks": false,
+    "names": ["Copilot", "GitHub", "ToolHive"]
+  },
+  "strong-style": {
+    "style": "asterisk"
+  },
+  "table-pipe-style": {
+    "style": "leading_and_trailing"
+  },
+  "ul-style": {
+    "style": "dash"
+  }
+}

.prettierignore

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+# Ignore autogenerated files
+docs/toolhive/reference/cli/**/*.md

.prettierrc

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+{
+  "jsxSingleQuote": true,
+  "printWidth": 80,
+  "proseWrap": "always",
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "es5",
+  "useTabs": false
+}

.vscode/extensions.json

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+{
+  "recommendations": [
+    "unifiedjs.vscode-mdx",
+    "esbenp.prettier-vscode",
+    "davidanson.vscode-markdownlint"
+  ]
+}

.vscode/settings.json

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+{
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "mdx.validate.validateFileLinks": "warning",
+  "mdx.validate.validateFragmentLinks": "warning",
+  "mdx.validate.validateMarkdownFileLinkFragments": "warning",
+  "mdx.validate.validateReferences": "warning",
+  "mdx.validate.validateUnusedLinkDefinitions": "hint",
+  "prettier.configPath": ".prettierrc",
+  "prettier.requireConfig": true,
+  "yaml.format.proseWrap": "always",
+  "css.lint.emptyRules": "ignore",
+
+  "[markdown]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[mdx]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[css]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[json]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[yaml]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  }
+}

eslint.config.mjs

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+import globals from 'globals';
+import pluginJs from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import pluginReact from 'eslint-plugin-react';
+import eslintConfigPrettier from 'eslint-config-prettier';
+import * as mdx from 'eslint-plugin-mdx';
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  { ignores: ['.docusaurus/', 'build/', 'node_modules/'] },
+  { files: ['**/*.{js,mjs,cjs,ts,jsx,tsx}'] },
+  { languageOptions: { globals: globals.node } },
+
+  pluginJs.configs.recommended,
+  ...tseslint.configs.recommended,
+  pluginReact.configs.flat.recommended,
+  eslintConfigPrettier,
+
+  // Configs for .mdx files
+  {
+    ...mdx.flat,
+    processor: mdx.createRemarkProcessor({
+      lintCodeBlocks: false,
+      languageMapper: {},
+    }),
+    rules: {
+      ...mdx.flat.rules,
+      'react/no-unescaped-entities': 'off',
+      'react/jsx-no-undef': ['error', { allowGlobals: true }],
+    },
+    languageOptions: {
+      ...mdx.flat.languageOptions,
+      globals: {
+        ...mdx.flat.languageOptions.globals,
+        // Add global components from src/theme/MDXComponents.tsx here
+        //Columns: 'readonly',
+        //Column: 'readonly',
+      },
+    },
+  },
+
+  {
+    settings: {
+      react: {
+        version: 'detect',
+      },
+    },
+  },
+];