Add ORBPath integration

[Kyle-Ye]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 16.87500% with 266 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.46%. Comparing base (7289cc0) to head (0219839).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/OpenSwiftUICore/Shape/Path.swift	14.75%	208 Missing ⚠️
Sources/OpenSwiftUICore/Shape/PathData.swift	0.00%	37 Missing ⚠️
...ces/OpenSwiftUICore/Shape/RoundedCornerStyle.swift	46.15%	21 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #680       +/-   ##
===========================================
+ Coverage   13.82%   28.46%   +14.63%     
===========================================
  Files         559      585       +26     
  Lines       32559    35480     +2921     
===========================================
+ Hits         4502    10099     +5597     
+ Misses      28057    25381     -2676     

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR integrates ORBPath/RenderBox-backed path handling into OpenSwiftUI’s core Path and rounded-rect utilities.

Changes:

• Updates SwiftPM pins for DarwinPrivateFrameworks/OpenCoreGraphics/OpenRenderBox to revisions that support the new path work.
• Renames the RenderBox feature flag plumbing (env var RENDERBOX) and switches build defines to OPENSWIFTUI_RENDERBOX.
• Adds a new CF_CGTYPES switch to control whether CFCGTypes-based CoreGraphics types are used (notably to avoid Linux conflicts).
• Reworks Path storage to support ORBPath-backed data and a buffer/serialization path for ORBPath storage.
• Introduces Swift PathData (union-like) for non-CF_CGTYPES builds and updates the C union definition for CF_CGTYPES builds.
• Renames/finishes RoundedCornerStyle and adds ORBPath-based temporary-path support for rounded-rect containment on Darwin.
• Extends the CoreGraphics overlay API: _CGPathCreateRoundedRect now takes a corner style enum and uses ORBPath/RBPath for continuous corners when enabled.
• Reorders Darwin CI setup steps and expands unit tests for FixedRoundedRect and rounded-rect path creation.

Technical Notes: The implementation relies on unsafe buffer layout compatibility between Swift/C unions and ORBPath storage callbacks, and gates behavior by platform and CF_CGTYPES configuration.

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[augmentcode]

Review completed. 2 suggestions posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

PathBox stores the CGPath using .passUnretained, but prepareBuffer() later calls data.cgPath.takeRetainedValue(), which assumes +1 ownership; this mismatch can cause over-release or use-after-free crashes.

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[augmentcode]

In bufferCallbacks.isSingleElement, the closure returns storage.isEmpty, which looks like a logic bug and will misreport whether the path has a single element.

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