feat(environment): update control size support

[Kyle-Ye]

Summary

• Move the control-size API into OpenSwiftUICore and distinguish an explicit size from the default regular size.
• Add the explicit environment value and cached graph input, and make the view modifier nonisolated.
• Match platform availability across SwiftPM and Xcode, refresh the lockfile, and document lockfile regeneration after manifest changes.

Validation

Scoped compilation, API access checks, and focused environment behavior checks passed with cached dependencies. Full package and UI builds were not run.

[augmentcode]

^{PR Risk Analyzer Agent 🛡️}

👀 Human review needed

Justification

This PR modifies AGENTS.md, which is in the opted-out agent-configuration category (**/AGENTS.md) that always requires full human review — these files govern how agents verify work in this repository, so the policy fails closed to human review regardless of other factors.

Beyond the opt-out, the change is broad and touches sensitive build/dependency surfaces:

• Package manifest & lockfile: Package.swift adds two availability macros (OpenSwiftUI_iOS_v3_0, OpenSwiftUI_watchOS_v4_0) and Package.resolved is regenerated (originHash change). Manifest/lockfile changes warrant human verification that the lockfile was regenerated correctly rather than hand-edited.
• Xcode build configs: both OpenSwiftUI.xcconfig and SwiftUI.xcconfig add matching availability macros; these must stay in sync with the SwiftPM manifest.
• Module relocation + behavioral change: ControlSize moves from OpenSwiftUI into OpenSwiftUICore, the ControlSizeKey default changes from eager .regular to nil with a computed ?? .regular fallback, a new package explicitControlSize accessor and cached _GraphInputs.controlSize graph input are added, and controlSize(_:) becomes nonisolated. The default-value and isolation changes affect public/package API semantics and merit human review.

Static analysis only; CI owns build and test verification.

_{Reviewed commit d2b49b8}

[augmentcode]

^{Deep Code Review Agent🐛}

Review completed with 2 suggestions.

_{Reviewed commit: d2b49b8}

[augmentcode]

^{Deep Code Review Agent🐛}

allCases is always available but now returns .large and .extraLarge, whose cases are gated by later availability. Callers targeting earlier supported OS versions can observe those values without an availability check, which breaks the API availability contract.

Severity: medium

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[augmentcode]

^{Deep Code Review Agent🐛}

This change adds the new explicitControlSize semantics, but there is no committed test that distinguishes an unset value (controlSize == .regular with explicitControlSize == nil) from an explicitly set .regular. That distinction is the main behavior added here, so future environment-key changes could regress it without CI coverage.

Severity: medium

---

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.56%. Comparing base (4fa6573) to head (d2b49b8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...SwiftUICore/Data/EnvironmentKeys/ControlSize.swift	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1133      +/-   ##
==========================================
- Coverage   30.89%   26.56%   -4.33%     
==========================================
  Files         880      821      -59     
  Lines       71040    61722    -9318     
==========================================
- Hits        21945    16399    -5546     
+ Misses      49095    45323    -3772     

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[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Ran test modules	Commit
OpenSwiftUI	✅	7	4cdf1589b

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	30.9s	4cdf1589b