docs: Add project documentation and Miyabi config

- Add AGENTS.md with agent specifications
- Add MIYABI.md with project overview
- Add README.github.md for GitHub display
- Add .miyabi/ configuration directory

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

Co-Authored-By: Claude <noreply@anthropic.com>

.miyabi/README.md

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+# .miyabi Directory
+
+Miyabi CLI設定ディレクトリ
+
+## 構造
+
+```
+.miyabi/
+├── agents/
+│   └── specs/          # Agent仕様定義
+├── commands/           # カスタムコマンド
+├── prompts/            # 再利用可能プロンプト
+├── templates/          # テンプレート
+├── sessions/           # 保存されたセッション
+└── config.toml         # 設定ファイル
+```
+
+## 設定ファイル
+
+`config.toml` で設定をカスタマイズ:
+
+```toml
+[api]
+model = "claude-sonnet-4-20250514"
+max_tokens = 8192
+
+[ui]
+theme = "tokyo-night"
+vim_mode = false
+
+[session]
+auto_save = true
+
+[tools]
+enable_bash = true
+```
+
+## カスタムコマンド
+
+`commands/` 配下に `*.md` ファイルを作成してカスタムコマンドを定義。
+
+## セッション管理
+
+```bash
+# セッション一覧
+miyabi sessions
+
+# Markdownエクスポート
+miyabi sessions -m <session-id>
+
+# 削除
+miyabi sessions -d <session-id>
+```
+
+## 使い方
+
+```bash
+# TUI起動
+miyabi
+
+# バージョン情報
+miyabi version
+
+# ヘルプ
+miyabi --help
+```

.miyabi/config.toml

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+# Miyabi CLI Configuration
+
+[api]
+# Anthropic API key (or set ANTHROPIC_API_KEY env var)
+# api_key = "your-api-key-here"
+model = "claude-sonnet-4-20250514"
+max_tokens = 8192
+timeout_secs = 120
+max_retries = 3
+
+[ui]
+show_sidebar = false
+show_status_bar = true
+show_breadcrumb = true
+theme = "tokyo-night"
+vim_mode = false
+show_line_numbers = true
+
+[session]
+auto_save = true
+auto_save_interval = 30
+max_sessions = 100
+
+[tools]
+enable_bash = true
+enable_file_tools = true
+enable_search_tools = true
+auto_approve_low_risk = false
+bash_timeout = 120

.miyabi/prompts/code-review.md

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+# Code Review Prompt
+
+以下のコードをレビューしてください：
+
+## チェックポイント
+- コードの品質と可読性
+- エラーハンドリング
+- パフォーマンス
+- セキュリティ
+- テストカバレッジ
+
+## 出力形式
+1. 問題点（重要度順）
+2. 改善提案
+3. 良い点

.miyabi/templates/issue.md

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+# Issue Template
+
+## Description
+[問題や機能の説明]
+
+## Requirements
+- [ ] 要件1
+- [ ] 要件2
+
+## Acceptance Criteria
+- [ ] 完了条件1
+- [ ] 完了条件2
+
+## Technical Notes
+[技術的な注意点]

AGENTS.md

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+# Repository Guidelines
+
+## Project Structure & Module Organization
+- Rust workspace lives under `crates/`: `miyabi-cli` (CLI entry), `miyabi-tui` (UI), and `miyabi-core` (shared logic, config, sessions). Shared workspace config in `Cargo.toml`.
+- TypeScript side sits in `src/` with `index.ts` as the entry point; Vitest specs live in `tests/`. Build artifacts output to `dist/`.
+- Supporting assets: `.claude/` agent configs, `docs/` for design notes, `.miyabi/` for local runtime data, and `.github/` for CI workflows.
+
+## Build, Test, and Development Commands
+- Rust: `cargo build --workspace --release` (release build), `cargo test --all` (unit/integration), `cargo clippy --all-targets -- -D warnings` (lint), `cargo fmt --all` (format).
+- TypeScript: `npm run dev` (tsx watch), `npm run build` (tsc emit to `dist/`), `npm run typecheck` (tsc no emit), `npm run lint` (eslint per `.eslintrc.json`), `npm test` (vitest).
+- Install toolchains: `npm install` for JS deps; Rust uses stable 1.75+ per workspace metadata.
+
+## Coding Style & Naming Conventions
+- Rust: run `cargo fmt` before commits; clippy must be clean with `-D warnings`. Modules/files use `snake_case`, types/traits `PascalCase`, constants `SCREAMING_SNAKE_CASE`. Prefer `anyhow::Result` and `thiserror` for errors; avoid `unwrap` in non-test code.
+- TypeScript: strict mode on; avoid `any` (warned), silence unused via `_` prefix. Follow ESLint rules and keep imports sorted logically. Prefer async/await over callbacks.
+
+## Testing Guidelines
+- Rust tests colocated in each crate (`mod tests` blocks or `tests/` directories); write integration tests when touching cross-crate behavior. Run `cargo test --all` before PRs.
+- TypeScript tests follow `*.test.ts` in `tests/`; structure with `describe/it` and keep fast. Aim to cover error paths and CLI flags.
+
+## Commit & Pull Request Guidelines
+- Use Conventional Commits (`feat:`, `fix:`, `refactor:`, `docs:`, `test:`, `chore:`). Keep subject under ~72 chars; include scope when helpful (`feat(tui): add diff renderer`).
+- PRs should describe the change, linked issue, and test evidence (`cargo test --all`, `npm test`, etc.). Add screenshots or terminal recordings for TUI changes when relevant. Keep diffs focused; separate refactors from feature work.
+
+## Environment & Configuration
+- Environment defaults from `.env.example`; typical variables: `GITHUB_TOKEN`, `ANTHROPIC_API_KEY`, `REPOSITORY`, optional `RUST_LOG`/`RUST_BACKTRACE` for debugging.
+- Local config/state lives in `~/.miyabi/` and `.miyabi/` (do not commit secrets). Review `.miyabi.yml` for runtime behavior before modifying agent workflows.

README.github.md

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+# miyabi-cli-standalone
+Autonomous development powered by Agentic OS