Add DeviceCheck App Attest workflow

[gaelic-ghost]

Summary

• add the Apple Dev Skills DeviceCheck and App Attest workflow with focused references and tests
• document Xcode command-line toolchain selection for stable and beta Xcode installs
• clean the shipped DeviceCheck plan into an implementation record

Verification

• bash .github/scripts/validate_repo_docs.sh
• uv run pytest
• uv run scripts/validate_socket_metadata.py
• git diff --check

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: bfff6e1f-4685-4016-bd01-e07d026088c9

📥 Commits

Reviewing files that changed from the base of the PR and between 7528c17 and 67e9c9e.

📒 Files selected for processing (34)

• ROADMAP.md
• docs/maintainers/agent-portability-options.md
• docs/maintainers/devicecheck-app-attest-skill-plan.md
• docs/maintainers/xcode-27-agentic-tooling-plan.md
• docs/maintainers/xcode-plugin-install-support-plan.md
• plugins/apple-dev-skills/.codex-plugin/plugin.json
• plugins/apple-dev-skills/.github/scripts/sync_shared_snippets.sh
• plugins/apple-dev-skills/.github/scripts/validate_repo_docs.sh
• plugins/apple-dev-skills/AGENTS.md
• plugins/apple-dev-skills/README.md
• plugins/apple-dev-skills/ROADMAP.md
• plugins/apple-dev-skills/docs/maintainers/customization-consolidation-review.md
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/SKILL.md
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/agents/openai.yaml
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/references/app-attest-client-flow.md
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/references/app-attest-server-validation.md
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/references/customization-flow.md
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/references/customization.template.yaml
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/references/devicecheck-device-state.md
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/references/entitlements-app-id-and-validation.md
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/references/snippets/apple-xcode-project-core.md
• plugins/apple-dev-skills/skills/devicecheck-app-attest-workflow/scripts/customization_config.py
• plugins/apple-dev-skills/skills/icon-composer-app-icon-workflow/SKILL.md
• plugins/apple-dev-skills/skills/xcode-app-project-workflow/references/toolchain-management.md
• plugins/apple-dev-skills/skills/xcode-build-run-workflow/references/toolchain-management.md
• plugins/apple-dev-skills/skills/xcode-coding-intelligence-workflow/SKILL.md
• plugins/apple-dev-skills/skills/xcode-coding-intelligence-workflow/references/mcpbridge-and-external-agents.md
• plugins/apple-dev-skills/skills/xcode-coding-intelligence-workflow/references/setup-and-agent-surfaces.md
• plugins/apple-dev-skills/skills/xcode-coding-intelligence-workflow/references/source-evidence.md
• plugins/apple-dev-skills/skills/xcode-testing-workflow/references/toolchain-management.md
• plugins/apple-dev-skills/tests/test_customization_consolidation_review.py
• plugins/apple-dev-skills/tests/test_devicecheck_app_attest_workflow.py
• plugins/apple-dev-skills/tests/test_xcode_coding_intelligence_workflow.py
• plugins/apple-dev-skills/tests/test_xcode_toolchain_selection_guidance.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/devicecheck-app-attest-plan

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