docs: sync guidance maintenance

[gaelic-ghost]

Summary

• Finish repo guidance and repo-maintenance sync.
• Land the completed maintenance branch into main.

Verification

• Ran the repo-maintenance validation for this branch.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 82c62921-6e21-49a8-bc26-3825a0681f9b

📥 Commits

Reviewing files that changed from the base of the PR and between 65608f0 and 8f0ba23.

📒 Files selected for processing (20)

• .codex/environments/xcode-project.toml
• .github/workflows/validate-repo-maintenance.yml
• .swiftformat
• AGENTS.md
• Docs/Architecture/RealAppTestingPlan.md
• README.md
• ROADMAP.md
• Sirious.xcodeproj/project.pbxproj
• Sources/App/App.swift
• Sources/App/AutomationHelperAgentState.swift
• Sources/App/AutomationHelperDiagnostics.swift
• Sources/AutomationHelperSupport/AutomationHelperXPC.swift
• Sources/Support/com.galewilliams.Sirious.AutomationHelper.plist
• Tests/SiriousTests/AutomationHelperAgentStateTests.swift
• Tests/SiriousTests/AutomationHelperDiagnosticsTests.swift
• project.yml
• scripts/repo-maintenance/lib/common.sh
• scripts/repo-maintenance/release.sh
• scripts/repo-maintenance/release/40-github-release.sh
• scripts/validate-installed-automation-helper.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/sync-guidance-maintenance

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