[codex] Redesign Core AI Lab around native Apple workflows

[rudrankriyam]

Summary

• reorganize the macOS app shell into Library, Build, Run, and Validate workflows with persistent native navigation and a contextual workspace inspector
• align toolbar controls to window edges, remove duplicate actions, and keep primary work visible without floating controls
• remove redundant subtitles and helper lines, tighten labels and statuses, and reveal workflow guidance only when it helps a decision or recovery
• redesign model, conversion, recipe, runtime, inspection, project, diarization, and device surfaces around progressive disclosure and honest evidence boundaries
• improve keyboard access, Dynamic Type reflow, VoiceOver context, canceled-picker handling, long identifier presentation, and empty/error/result states
• incorporate the macOS-only target from current main and keep the checked-in Xcode project authoritative
• make real-runtime contract tests parallel-safe and use the active Xcode installation for standalone export verification

Design basis

The redesign was benchmarked directly against the interaction and information hierarchy used by Xcode, Create ML, and Instruments, then checked against Apple guidance for layout, sidebars, lists and tables, buttons, writing, and accessibility.

Validation

• Xcode 27 macOS arm64 build: passed
• macOS contract tests: 290 total, 282 passed, 8 opt-in external-asset tests skipped, 0 failed
• live macOS inspection: app shell, inspector, toolbar alignment, empty project state, Apple Models, model detail, Chatterbox, Diarization, Runtime Studio, Asset Inspector, and Device Lab
• JSON and DESIGN.md frontmatter validation: passed
• all current review threads addressed and resolved

Physical-device model runs were not performed because they require an unlocked iOS 27+ device, signing assets, and external model inputs.

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Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

There are 3 total unresolved issues (including 2 from previous reviews).

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