Add Tuist support for Example project

[Kyle-Ye]

Summary

• Replace the checked-in Example Xcode project with a Tuist-generated project definition.
• Model the existing Example, HostingExample, TestingHost, and UI test schemes in Example/Project.swift.
• Add Example-specific Tuist dependency configuration, mise tooling, and README setup instructions.
• Move UI test Xcode/mise/Tuist/build-environment setup into the reusable uitests composite action.

Notes

• This uses local package paths for OpenSwiftUI, OpenAttributeGraph, OpenRenderBox, and DarwinPrivateFrameworks while keeping OPENSWIFTUI_USE_LOCAL_DEPS=0 for the Example Tuist environment.
• The BacklightServices simulator install issue is handled by [Optimize] [BLS] Fix BacklightServices framework Info.plist DarwinPrivateFrameworks#65, which has already been merged.

[Kyle-Ye]

/uitest macos

[augmentcode]

🤖 Augment PR Summary

Summary: This PR migrates the checked-in Example Xcode project to a Tuist-generated project setup and updates CI to generate the workspace before running snapshot/UI tests.

Changes:

• Moves UI test workflow setup (Xcode selection + build environment prep) into the reusable .github/actions/uitests composite action.
• Adds an xcode-version input to the UI test composite action and wires it through the workflow matrix.
• Replaces the committed Example.xcodeproj + shared schemes with a Tuist manifest (Example/Project.swift) modeling Example/HostingExample/TestingHost and test schemes.
• Adds a Tuist dependency package (Example/Tuist/Package.swift) and relocates Package.resolved under Example/Tuist.
• Adds Example-specific mise/Tuist configuration and updates the Example README with new setup + generation steps.
• Adds Example/.gitignore to ignore Tuist-generated Xcode projects/workspaces and build artifacts.

Technical Notes: CI now installs Tuist via mise, runs tuist install/tuist generate in Example/, then executes the existing xcodebuild test schemes for snapshot comparisons.

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[augmentcode]

Review completed. 3 suggestions posted.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.80%. Comparing base (850f032) to head (1d11a95).
⚠️ Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (850f032) and HEAD (1d11a95). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (850f032)	HEAD (1d11a95)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #865       +/-   ##
===========================================
- Coverage   25.72%   13.80%   -11.92%     
===========================================
  Files         677      637       -40     
  Lines       47008    41270     -5738     
===========================================
- Hits        12091     5697     -6394     
- Misses      34917    35573      +656     

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[Kyle-Ye]

/uitest macos

[Kyle-Ye]

/uitest macos

[Kyle-Ye]

/uitest macos

[Kyle-Ye]

/uitest macos