refactor(claude): Migrate agents to agent skills

.claude/skills/browser-extension-developer/SKILL.md

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+---
+name: browser-extension-developer
+description: Use this skill when developing or maintaining browser extension code in the `browser/` directory, including Chrome/Firefox/Edge compatibility, content scripts, background scripts, or i18n updates.
+---
+
+# Browser Extension Developer
+
+Cross-browser extension (Chrome/Firefox/Edge) using **WXT framework** with Manifest V3. Injects "Repomix" button into GitHub repository pages.
+
+## Structure
+
+```plaintext
+browser/
+├── entrypoints/       # background.ts, content.ts
+├── public/_locales/   # i18n (12 languages)
+├── wxt.config.ts      # WXT configuration
+└── .output/           # Built files (chrome-mv3, firefox-mv2)
+```
+
+## Commands
+
+- `npm run dev` - Development mode (Chrome default)
+- `npm run dev:firefox` - Firefox dev mode
+- `npm run build-all` - Build all browsers
+- `npm run lint` / `npm run test`
+
+## i18n
+
+12 languages: en, ja, de, fr, es, pt_BR, id, vi, ko, zh_CN, zh_TW, hi
+
+New language: Create `public/_locales/[code]/messages.json` with keys: appDescription, openWithRepomix
+
+## Notes
+
+- Chrome/Edge use `chrome.*` APIs, Firefox may need polyfills
+- Run lint and tests before completion

.claude/skills/lint-fixer/SKILL.md

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+---
+name: lint-fixer
+description: "Use this skill to run npm run lint and fix linting issues. Triggers on fixing lint errors after code changes or validating code against project style guidelines."
+---
+
+# Lint Fixer
+
+Fix linting issues while preserving code functionality.
+
+## Lint Tools
+
+`npm run lint` runs 4 tools in sequence:
+
+1. **Biome** (`biome check --write`) - Formatter + linter, auto-fixes
+2. **oxlint** (`oxlint --fix`) - Fast JS/TS linter, auto-fixes
+3. **tsgo** (`tsgo --noEmit`) - TypeScript type checking
+4. **secretlint** - Detects secrets/credentials
+
+## Workflow
+
+1. Run `npm run lint` to identify issues
+2. Review errors by category (type errors vs style vs secrets)
+3. Fix issues - Biome/oxlint auto-fix most style issues
+4. Run `npm run lint` again to verify
+5. Run `npm run test` to ensure no breakage
+
+## Config Files
+
+- `biome.json` - Formatting rules (2 spaces, 120 chars, single quotes)
+- `.oxlintrc.json` - JS/TS lint rules
+- `.secretlintrc.json` - Secret detection rules
+
+## Key Points
+
+- Biome/oxlint auto-fix most issues; review changes
+- Type errors (tsgo) require manual fixes
+- Never change code behavior when fixing lint
+- Keep files under 250 lines

.claude/skills/website-maintainer/SKILL.md

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+---
+name: website-maintainer
+description: Use this skill when working on the Repomix documentation website in `website/` directory, including VitePress configuration, multi-language content, or translation workflows.
+---
+
+# Website Maintainer
+
+VitePress documentation site with 12 languages.
+
+## Structure
+
+```plaintext
+website/client/
+├── .vitepress/
+│   ├── config.ts           # Main config (imports all locales)
+│   └── config/
+│       ├── configShard.ts  # Shared settings (PWA, sitemap, etc.)
+│       └── config[Lang].ts # Per-language config (nav, sidebar, search)
+└── src/
+    └── [lang]/             # en, ja, zh-cn, zh-tw, ko, de, fr, es, pt-br, id, vi, hi
+```
+
+## Adding New Language
+
+1. Create `config/configXx.ts` based on existing (exports config + search translations)
+2. Import and add to `locales` in `config.ts`
+3. Add search config to `configShard.ts`
+4. Create `src/xx/` directory with content (copy from `en/`)
+
+## Editing Content
+
+- **Documents**: Edit `src/[lang]/guide/*.md` (e.g., `src/ja/guide/installation.md`)
+- **Navigation/Sidebar**: Edit `config/config[Lang].ts` → `themeConfig.sidebar`
+- **Shared settings** (logo, footer): Edit `configShard.ts`
+
+## Translation Guidelines
+
+- English (`src/en/`) is source of truth
+- Keep code examples and CLI options unchanged
+- Translate UI labels in config file (nav, sidebar, search modal)