Enable OSUI ViewRenderer by default

[Kyle-Ye]

Agent Summary

What Changed

• Renamed the SwiftUI render build flag to OPENSWIFTUI_SWIFTUI_RENDER and defaulted it off for package builds.
• Kept kdebug interposition available outside the SwiftUI renderer path.
• Made the SwiftUI-backed renderer path explicit across OpenSwiftUI, OpenSwiftUICore, symbol dual test stubs, and UI test workflows.
• Added ViewRendererVendor so runtime code and tests can identify whether OpenSwiftUI or SwiftUI rendering is active.
• Replaced the compile-time SwiftUI ABI check with a runtime availability guard that only runs when the SwiftUI renderer path is used.
• Updated integration docs to state that renderer ABI limits do not apply unless OPENSWIFTUI_SWIFTUI_RENDER=1 is enabled.

Why

The default integration path should not inherit SwiftUI renderer ABI restrictions. Those restrictions are only relevant when callers explicitly choose the SwiftUI renderer implementation.

Validation

• OPENSWIFTUI_USE_LOCAL_DEPS=1 OPENSWIFTUI_SWIFTUI_RENDER=1 OPENATTRIBUTEGRAPH_OPENATTRIBUTESHIMS_ATTRIBUTEGRAPH=1 swift build --target OpenSwiftUICore

[augmentcode]

🤖 Augment PR Summary

Summary: This PR makes OpenSwiftUI’s own view renderer the default, and treats the SwiftUI-backed renderer as an explicit opt-in path.

Changes:

• Switched the SwiftUI renderer build flag to OPENSWIFTUI_SWIFTUI_RENDER and defaulted it off for SwiftPM builds.
• Updated Swift/C/C++ conditional compilation sites to use the new flag name.
• Made SwiftUI renderer ABI validation runtime-based (only enforced when the SwiftUI renderer path is enabled).
• Kept kdebug_is_enabled interposition available even when not using the SwiftUI renderer.
• Added ViewRendererVendor + viewRendererVendor so code/tests can detect which renderer is active.
• Adjusted UI test workflows to run with OPENSWIFTUI_SWIFTUI_RENDER=1.
• Updated integration documentation to clarify ABI restrictions are optional/opt-in.

Technical Notes: Package settings now define OPENSWIFTUI_SWIFTUI_RENDER only for Darwin platforms; build scripts default it to 0 unless explicitly overridden.

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[augmentcode]

Review completed. 1 suggestion posted.

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[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.06%. Comparing base (0674dc5) to head (c79cea0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...e/Render/DisplayList/DisplayListViewRenderer.swift	72.72%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #872      +/-   ##
==========================================
+ Coverage   25.71%   27.06%   +1.34%     
==========================================
  Files         677      678       +1     
  Lines       47008    47004       -4     
==========================================
+ Hits        12090    12721     +631     
+ Misses      34918    34283     -635     

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[Kyle-Ye]

/uitest

[Kyle-Ye]

/uitest macos