Add experimental Apple Silicon macOS RC path

[rodgons]

Summary

• integrate the Apple Silicon SimpleGraphic runtime into the agreed macOS app bundle layout
• add external-update policy and macOS shortcut/path compatibility
• package, verify, checksum, and smoke-test zipped macOS RC artifacts
• publish gated macos-* experimental prereleases without invoking Windows installer automation

Validation

• 410 Lua tests pass
• focused macOS policy/build-list tests pass
• ModCache regeneration is clean
• real arm64 app build, native closure/signature checks, archive extraction, SimpleGraphic acceptance smoke, and Path of Building initialization smoke pass on Apple Silicon
• two-axis standards/spec review found no remaining actionable issue

Implements #10 and #11. Prerequisite for exact artifact validation in #12.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: fae377ef-d970-4a8f-a261-0471dcb76f23

📥 Commits

Reviewing files that changed from the base of the PR and between 40e1a3f and 13fb508.

📒 Files selected for processing (20)

• .github/workflows/installer.yml
• .github/workflows/macos-release.yml
• .gitignore
• macos/Info.plist.in
• macos/README.md
• macos/build-app.sh
• macos/launcher.c
• macos/package-release.sh
• macos/verify-app.sh
• spec/System/TestBuildListHelpers_spec.lua
• spec/System/TestUpdatePolicy_spec.lua
• src/Classes/ItemsTab.lua
• src/Classes/NotesTab.lua
• src/Classes/PassiveTreeView.lua
• src/Classes/SkillsTab.lua
• src/Classes/TradeQuery.lua
• src/Launch.lua
• src/Modules/Build.lua
• src/Modules/BuildListHelpers.lua
• src/Modules/Main.lua

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-11-macos-release

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