docs(readme): --no-quarantine 案内を削除 (Homebrew 4.5 で廃止)

[shomatan]

概要

PR #194 で書いた brew reinstall --cask --no-quarantine ignission/tap/ark の案内が
現行 Homebrew では動かない:

Error: Calling the `--[no-]quarantine` switch is disabled! There is no replacement.

Homebrew 4.5 で --no-quarantine switch と HOMEBREW_CASK_OPTS=--no-quarantine
環境変数の両方が 代替なしで廃止 された (Homebrew/brew#19046)。

修正

• 「対処 A / 対処 B」の二択から xattr -dr 一択 に絞る
• NOTE で --no-quarantine 廃止の事実と参考 PR リンクを補足
• xattr 手順の直前に「sha256 照合済みであることを前提」と再強調 (codex [High] 指摘反映)

関連

• 前 README 更新: docs(readme): macOS install を --no-quarantine 必須に更新 #194
• 署名対応 (feat(release): macOS .app の Developer ID 署名 + 公証 (notarization) を有効化 #193) 完了時にはこのセクション自体を削除予定

Summary by CodeRabbit

• Documentation
  • Updated macOS Quick Start guide with instructions for verifying authenticity and removing quarantine attributes after installation
  • Added notes about Homebrew 4.5+ compatibility changes affecting installation methods

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 62c0049a-509b-4deb-a7b2-b4da1d5327ea

📥 Commits

Reviewing files that changed from the base of the PR and between 50ea374 and 0661f05.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README.md documentation updated to clarify macOS quarantine attribute handling. Installation guidance now requires authenticity verification before manual post-installation quarantine removal. A new note documents Homebrew 4.5's removal of install-time workaround flags, making post-install xattr -dr the only remaining option.

Changes

macOS Installation Documentation

Layer / File(s)	Summary
Quarantine attribute handling guidance README.md	Installation troubleshooting text updated to direct users to verify authenticity via the CAUTION section before manually removing quarantine attributes post-installation. A NOTE added documenting Homebrew 4.5 deprecation of --no-quarantine and HOMEBREW_CASK_OPTS=--no-quarantine, with xattr -dr as the remaining post-install workaround.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• ignission/claude-code-ark#194: Both PRs modify the macOS README "Quick Start" install/troubleshooting text for the same Gatekeeper "Ark は壊れているため開けません" issue, including documenting xattr -dr com.apple.quarantine and brew ... --no-quarantine workarounds.

Poem

🐰 A rabbit's burrow needs clear signs to navigate the dark tunnels,
So too macOS seekers need guidance through Gatekeeper's quarantine gates,
When Homebrew's old tricks fade to dust in version 4.5's march,
xattr -dr stands ready, the steadfast path through the woods,
Instructions renewed, documentation bright—the warren is safer now! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: removing the --no-quarantine guidance from the README due to its deprecation in Homebrew 4.5, which directly aligns with the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-drop-no-quarantine

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