Add UIKitUpdateCycle API

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Introduces a UIKit “update cycle” integration point so OpenSwiftUI can run work right before UIKit’s CATransaction commit.

Changes:

• Extends UIKit_Private.h with additional UIKitCore private UIUpdate-cycle symbols (enabled check, timing structs, and sequence item insertion/removal APIs).
• Adds UIKitUpdateCycle (iOS/visionOS) to register pre-commit observers via _UIUpdateSequenceInsertItem and execute queued actions under Update.perform.
• Promotes Update.perform to package visibility so it can be invoked from the OpenSwiftUI target.

Technical Notes: The pre-commit hook is registered once (static token) and drains an in-memory action queue on each callback.

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[augmentcode]

Review completed. 1 suggestions posted.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 14.29%. Comparing base (c3a3efb) to head (57bb397).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/OpenSwiftUICore/Data/Update.swift	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (c3a3efb) and HEAD (57bb397). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (c3a3efb)	HEAD (57bb397)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #704       +/-   ##
===========================================
- Coverage   28.75%   14.29%   -14.46%     
===========================================
  Files         589      563       -26     
  Lines       35836    33190     -2646     
===========================================
- Hits        10303     4743     -5560     
- Misses      25533    28447     +2914     

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