Fix cmux IME shortcuts via Karabiner input source selector

[keito4]

Summary

• switch cmux IME shortcuts from virtual kana/eisu keys to Karabiner's built-in select_input_source action
• keep Caps Lock as Ctrl and include left/right Ctrl plus Caps Lock shortcut variants
• set the Karabiner virtual keyboard type to ANSI to avoid the keyboard type prompt and JIS key drift on the external keyboard

Verification

• npm test -- --runTestsByPath test/nix-darwin-config.test.js
• npm run format:check
• npm run lint
• karabiner_cli --lint-complex-modifications .context/karabiner.generated.json
• karabiner_cli --lint-complex-modifications /Users/keito/.config/karabiner/karabiner.json

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 55add99a-03ae-40d8-9858-119d5db11dec

📥 Commits

Reviewing files that changed from the base of the PR and between 1400335 and 628a15f.

📒 Files selected for processing (8)

• docs/adr/0016-use-kanary-for-keyboard-remapping.md
• nix/home/default.nix
• nix/home/karabiner.nix
• nix/hosts/darwin/default.nix
• nix/modules/homebrew.nix
• nix/modules/kanary.nix
• script/macos/agent-select-input-source.sh
• test/nix-darwin-config.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/cmux-external-terminal-links

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[claude]

Claude finished @keito4's task in 0s —— View job

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I'll analyze this and get back to you.

[keito4]

(aside)
@claude PRがbaseにマージする際にコンフリクトが発生しています。最新のbaseからpullし、修正してください。

[claude]

Claude finished @keito4's task in 9m 10s —— View job

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マージコンフリクトの解消 ✅

• 現在のブランチ状態を確認
• 最新の main をフェッチ
• コンフリクトを分析・解消
• テスト・フォーマット確認
• 変更をコミット・プッシュ

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解消内容

origin/main (PR #893: Karabiner → Kanary 置換) との差分を解消しました。

ファイル	対応
nix/home/karabiner.nix	削除（Kanary置換により不要）
nix/home/default.nix	karabiner.nix インポートを削除
nix/hosts/darwin/default.nix	kanary.nix インポートを追加
nix/modules/homebrew.nix	karabiner-elements を削除
nix/modules/kanary.nix	新規追加（Kanary要件チェック）
docs/adr/0016-use-kanary-for-keyboard-remapping.md	新規追加（ADR）
script/macos/agent-select-input-source.sh	復元（mainに存在）
script/macos/select-input-source.swift	復元（mainに存在）
test/nix-darwin-config.test.js	Kanary対応バージョンに更新（9テスト全通過）

コミット: 628a15f
| Branch

[keito4]

Closing this PR because it has been superseded by #893, which replaced the Karabiner-based keyboard remapping path with Kanary. The remaining diff is not a separate change to merge.