docs: translate all Japanese docs to English

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,17 +1,17 @@
-name: バグ報告
-description: 不具合の報告
+name: Bug report
+description: Report a bug
 labels: ["bug"]
 body:
   - type: markdown
     attributes:
       value: |
-        バグ報告ありがとうございます。以下のフォームを埋めてください。
-        再現可能な最小コードを添えていただけると助かります。
+        Thanks for reporting a bug. Please fill out the form below.
+        A minimal reproducible example would be greatly appreciated.
   - type: input
     id: version
     attributes:
-      label: rwc のバージョン
-      description: "例: v0.0.4 (rwc --version の出力)"
+      label: rwc version
+      description: "e.g. v0.0.4 (output of rwc --version)"
       placeholder: "v0.0.4"
     validations:
       required: true
@@ -23,35 +23,35 @@ body:
         - Linux
         - macOS
         - Windows
-        - その他
+        - Other
     validations:
       required: true
   - type: textarea
     id: reproduce
     attributes:
-      label: 再現手順
-      description: バグを再現するための手順を記載してください。
+      label: Steps to reproduce
+      description: Describe the steps to reproduce the bug.
       placeholder: |
-        1. 以下のコードを `bug.rw` に保存
-        2. `rwc bug.rw` を実行
+        1. Save the following code to `bug.rw`
+        2. Run `rwc bug.rw`
         3. ...
     validations:
       required: true
   - type: textarea
     id: expected
     attributes:
-      label: 期待される挙動
+      label: Expected behavior
     validations:
       required: true
   - type: textarea
     id: actual
     attributes:
-      label: 実際の挙動
+      label: Actual behavior
     validations:
       required: true
   - type: textarea
     id: additional
     attributes:
-      label: 追加情報
-      description: スタックトレース、IR ダンプ、関連ログなどがあれば貼り付けてください。
+      label: Additional information
+      description: Paste any stack traces, IR dumps, or relevant logs if available.
       render: shell

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
-  - name: 質問・ディスカッション
+  - name: Questions and discussions
     url: https://github.com/ryuichi1208/rw/discussions
-    about: 質問やアイデアの議論は Discussions へ
+    about: For questions and idea discussions, please use Discussions

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,34 +1,34 @@
-name: 機能要望
-description: 新機能・改善の提案
+name: Feature request
+description: Propose a new feature or improvement
 labels: ["enhancement"]
 body:
   - type: markdown
     attributes:
       value: |
-        新機能・改善提案ありがとうございます。
-        大きめの設計提案の場合は RFC テンプレートの利用もご検討ください。
+        Thanks for proposing a new feature or improvement.
+        For larger design proposals, please consider using the RFC template.
   - type: textarea
     id: motivation
     attributes:
-      label: 背景・モチベーション
-      description: なぜこの機能が必要なのか、現状の課題は何かを記述してください。
+      label: Background and motivation
+      description: Explain why this feature is needed and what the current problem is.
     validations:
       required: true
   - type: textarea
     id: proposal
     attributes:
-      label: 提案する機能
-      description: 具体的な機能内容、想定される API / 構文 / 挙動などを記述してください。
+      label: Proposed feature
+      description: Describe the concrete feature, the expected API / syntax / behavior, and so on.
     validations:
       required: true
   - type: textarea
     id: alternatives
     attributes:
-      label: 代替案
-      description: 検討した他のアプローチがあれば記載してください。
+      label: Alternatives
+      description: List any other approaches you considered.
   - type: textarea
     id: scope
     attributes:
-      label: 影響範囲
-      description: "影響する領域 (lang / runtime / stdlib / tooling など) を記載してください。"
-      placeholder: "例: lang (parser, type checker), runtime (netpoller)"
+      label: Scope of impact
+      description: "Describe the affected areas (lang / runtime / stdlib / tooling, etc.)."
+      placeholder: "e.g. lang (parser, type checker), runtime (netpoller)"

.github/ISSUE_TEMPLATE/rfc.yml

@@ -1,48 +1,48 @@
 name: RFC
-description: 設計提案 (Request For Comments)
+description: Design proposal (Request For Comments)
 labels: ["rfc", "documentation"]
 body:
   - type: markdown
     attributes:
       value: |
-        言語仕様・ランタイム・標準ライブラリなどの設計変更を提案するためのテンプレートです。
-        実装着手前に議論したい大きな変更はこちらでお願いします。
+        A template for proposing design changes to the language specification, runtime, standard library, and so on.
+        Please use this for large changes you want to discuss before starting implementation.
   - type: input
     id: title
     attributes:
-      label: RFC タイトル
-      placeholder: "例: async generator の導入"
+      label: RFC title
+      placeholder: "e.g. Introduce async generators"
   - type: textarea
     id: summary
     attributes:
-      label: 要約 (TL;DR)
-      description: 提案内容を 2-3 行で要約してください。
+      label: Summary (TL;DR)
+      description: Summarize the proposal in 2-3 lines.
   - type: textarea
     id: motivation
     attributes:
-      label: 動機・背景
-      description: 解決したい問題、現状の制約、ユースケースなど。
+      label: Motivation and background
+      description: The problem you want to solve, current limitations, use cases, etc.
     validations:
       required: true
   - type: textarea
     id: design
     attributes:
-      label: 詳細設計
-      description: 構文 / セマンティクス / 型システム / ABI など、変更点を可能な限り詳細に。
+      label: Detailed design
+      description: Describe the changes in as much detail as possible, including syntax / semantics / type system / ABI.
     validations:
       required: true
   - type: textarea
     id: alternatives
     attributes:
-      label: 代替案
-      description: 検討した他の設計、それを採用しなかった理由。
+      label: Alternatives
+      description: Other designs you considered and why you did not adopt them.
   - type: textarea
     id: impact
     attributes:
-      label: 影響範囲・移行戦略
-      description: 既存コードへの影響、後方互換性、移行手順など。
+      label: Scope of impact and migration strategy
+      description: Impact on existing code, backward compatibility, migration steps, etc.
   - type: textarea
     id: open_questions
     attributes:
       label: Open Questions
-      description: 議論したい未解決の論点を列挙してください。
+      description: List any unresolved points you want to discuss.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,19 +1,19 @@
-## 概要
+## Overview
 
-<!-- このPRの目的を1-3行で -->
+<!-- Describe the purpose of this PR in 1-3 lines -->
 
-## 変更点
+## Changes
 
 - 
 
-## 関連 issue
+## Related issues
 
 Closes #
 
-## チェックリスト
+## Checklist
 
-- [ ] テストを追加 / 既存テストを更新した
-- [ ] ドキュメントを更新した（必要に応じて）
-- [ ] ローカルで `uv run pytest` が通る
-- [ ] C runtime を変更した場合 `make -C runtime test` が通る
-- [ ] 破壊的変更がある場合は CHANGELOG.md / docs に記載
+- [ ] Added tests / updated existing tests
+- [ ] Updated documentation (if needed)
+- [ ] `uv run pytest` passes locally
+- [ ] `make -C runtime test` passes if the C runtime was changed
+- [ ] Documented breaking changes in CHANGELOG.md / docs, if any

.github/workflows/lint.yml

@@ -1,4 +1,4 @@
-# 段階適用方針: 当初は warning として運用し、PR ごとに対象を絞って fail に切り替える
+# Gradual rollout policy: start as warnings, then switch to failures for targeted scopes per PR
 name: lint
 
 on:

CHANGELOG.md

@@ -2,39 +2,39 @@
 
 ## [v0.0.6](https://github.com/rwlang-org/rw/compare/v0.0.5...v0.0.6) - 2026-06-21
 
-- ci: ruff/black/mypy による lint/format チェック (#76) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/124
-- chore: pre-commit-hooks 設定を追加 (#88) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/125
-- docs: CONTRIBUTING.md を追加 (#70) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/126
-- docs: Issue / PR テンプレートを追加 (#72) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/127
-- ci: GitHub Actions を SHA ピン留めし dependabot を追加 (#81) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/128
-- docs: CoC / SECURITY / LICENSE を整備 (#71) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/129
+- ci: add lint/format checks with ruff/black/mypy (#76) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/124
+- chore: add pre-commit-hooks configuration (#88) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/125
+- docs: add CONTRIBUTING.md (#70) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/126
+- docs: add Issue / PR templates (#72) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/127
+- ci: SHA-pin GitHub Actions and add dependabot (#81) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/128
+- docs: add CoC / SECURITY / LICENSE (#71) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/129
 
 ## [v0.0.5](https://github.com/rwlang-org/rw/compare/v0.0.4...v0.0.5) - 2026-06-06
 
-- examples: TCP チャットサーバのサンプル追加 by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/113
-- 言語: 三項演算子 / 条件式 (x if cond else y) を実装 by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/114
-- docs: 条件式(三項演算子)の言語仕様を追加 by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/115
-- stdlib: ファイル I/O と fd 汎用 read/write/close (#33) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/116
-- runtime: ファイル I/O を非同期化（スレッドプールにオフロード） by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/117
-- lang: 数値リテラル拡張（16進・8進・2進・指数・アンダースコア区切り） by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/118
-- lang: ビット演算子 (& | ^ ~ << >>) を実装 by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/119
-- lang: break / continue 文を実装（while ループ対象） by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/120
-- lang: assert 文を実装 by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/121
-- lang: 型エイリアス (type Foo = ...) を実装 by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/122
-- stdlib: math 組み込み関数を実装（LLVM intrinsic） by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/123
+- examples: add a TCP chat server sample by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/113
+- lang: implement the ternary / conditional expression (x if cond else y) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/114
+- docs: add the language spec for the conditional (ternary) expression by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/115
+- stdlib: file I/O and generic fd read/write/close (#33) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/116
+- runtime: make file I/O asynchronous (offload to a thread pool) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/117
+- lang: extend numeric literals (hex, octal, binary, exponent, underscore separators) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/118
+- lang: implement bitwise operators (& | ^ ~ << >>) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/119
+- lang: implement break / continue statements (targeting while loops) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/120
+- lang: implement the assert statement by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/121
+- lang: implement type aliases (type Foo = ...) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/122
+- stdlib: implement math built-in functions (LLVM intrinsics) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/123
 
 ## [v0.0.4](https://github.com/rwlang-org/rw/compare/v0.0.3...v0.0.4) - 2026-05-23
-- rwc + runtime: netpoller + 最小 TCP API (echo server) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/97
+- rwc + runtime: netpoller + minimal TCP API (echo server) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/97
 
 ## [v0.0.3](https://github.com/rwlang-org/rw/compare/v0.0.2...v0.0.3) - 2026-05-23
-- rwc: 文字列の最小拡張 (len, ==, +) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/91
-- rwc: Bytes 型 (immutable, echo 最小セット) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/92
-- rwc: List[int] 型 (immutable, モノモーフ, echo 最小セット) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/93
-- rwc: Option[int] 型と最小 match 構文 (Python 3.10 風) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/94
-- rwc: Result[int, int] 型と match の Ok/Err アーム拡張 by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/95
+- rwc: minimal string extensions (len, ==, +) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/91
+- rwc: Bytes type (immutable, minimal echo set) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/92
+- rwc: List[int] type (immutable, monomorphic, minimal echo set) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/93
+- rwc: Option[int] type and minimal match syntax (Python 3.10 style) by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/94
+- rwc: Result[int, int] type and Ok/Err arm extension for match by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/95
 
 ## [v0.0.2](https://github.com/rwlang-org/rw/compare/v0.0.1...v0.0.2) - 2026-05-20
-- ランタイムを Go 風 M:N スケジューラに進化させる by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/90
+- evolve the runtime into a Go-style M:N scheduler by @ryuichi1208 in https://github.com/rwlang-org/rw/pull/90
 
 ## [v0.0.1](https://github.com/ryuichi1208/rw/commits/v0.0.1) - 2026-05-17
 - rw v0.0.1: MVP compiler with fiber-backed runtime by @ryuichi1208 in https://github.com/ryuichi1208/rw/pull/1