feat(mac): add bundled starforge lab scaffold

[StressTestor]

what changed

• adds the SwiftPM macOS Starforge Lab scaffold and Codex run action
• adds Codable manifest/request models, subprocess argument building, render service, and persistence shells
• adds v7.0.1 manifest fixtures, including --studio --curator studio
• adds local Python bundle vending via BeeWare Python-Apple-support plus pinned NumPy/Pillow wheels
• adds bundled interpreter parity tooling comparing RenderService output to the direct bundled CLI

why

The macOS wrapper needs to prove it drives the real starforge.cli, not a Swift port or system Python. This sets up the app structure and a reproducible local bundle path while keeping the engine surface identical to upstream v7.0.1.

validation

• PYTHONDONTWRITEBYTECODE=1 PYTHONPATH=. pytest -p no:cacheprovider -q -> 80 passed
• swift build && swift run StarforgeLabChecks -> passed
• STARFORGE_BUNDLE_RESOURCES="$PWD/StarforgeLab/Resources" PATH=/usr/bin:/bin /usr/bin/swift run StarforgeLabParity -> parity=pass
• bundled parity signature: Darwin-arm64-py3.12-numpy2.4.2-pillow12.1.0
• bundled parity poster SHA-256: 3113c258e90af1e79102cd1fbf34d55c341c41e0d7d3b1f6b216b9154d069112

still open

• universal2 wheel payload for pinned NumPy/Pillow; current local wheel payload is host-arch arm64 because PyPI does not publish universal2 wheels for these exact versions
• WKWebView studio bridge
• Developer ID signing, hardened runtime, notarization, and stapling