docs: emphasize project-agnostic benefit of claude-code-workflows

Update README descriptions to highlight that claude-code-workflows works with any project due to its plugin architecture (installed in ~/.claude/).

Changes:
- README.md: "get started immediately" → "start with any project"
- README.ja.md: "2コマンドですぐ始められる" → "どんなプロジェクトでも2コマンドで始められる"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: shinpr

README.ja.md

@@ -28,7 +28,7 @@
 
 > **どれを使うべき？**
 > - **このボイラープレート**を使う → **Claude Code**で**TypeScript × サブエージェント**に最適化し、**精度を最大化**したい場合
-> - **[claude-code-workflows](https://github.com/shinpr/claude-code-workflows)**を使う → **Claude Code**で**2コマンドですぐ始められる**、**プログラミング言語非依存**のワークフロー
+> - **[claude-code-workflows](https://github.com/shinpr/claude-code-workflows)**を使う → **Claude Code**で**どんなプロジェクトでも2コマンドで始められる**、**プログラミング言語非依存**のワークフロー
 > - **[Agentic Code](https://github.com/shinpr/agentic-code)**を使う → **設定不要**で**どんなツール**でも**プログラミング言語の指定なく**開発したい場合（Codex CLI/Cursor/Aider等）
 
 ## ⚡ クイックスタート（3ステップ）

README.md

@@ -28,7 +28,7 @@
 
 > **Which one should you use?**
 > - **Use this Boilerplate** if you want to **maximize precision** with **TypeScript × Sub-agent** setup optimized for **Claude Code**.
-> - **Use [claude-code-workflows](https://github.com/shinpr/claude-code-workflows)** if you're on **Claude Code** and want to **get started immediately** with **2 commands** and **language-agnostic** workflows.
+> - **Use [claude-code-workflows](https://github.com/shinpr/claude-code-workflows)** if you're on **Claude Code** and want to **start with any project** in **2 commands** and **language-agnostic** workflows.
 > - **Use [Agentic Code](https://github.com/shinpr/agentic-code)** if you want **zero-config**, **tool-agnostic** workflows **without language restrictions** (Codex CLI/Cursor/Aider etc.).
 
 ## ⚡ Quick Start (3 Steps)