Fix PropertyList mutation and comparison semantics

[Kyle-Ye]

Summary

• preserve PropertyList elements during value lookup and mutation
• pass ignored property types by value so comparisons do not mutate caller-owned arrays
• tighten access to PropertyList.Element implementation details
• add direct and symbol-dual coverage for preserving ignored type lists

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.63%. Comparing base (aac2186) to head (95a1994).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...urces/OpenSwiftUICore/Data/Util/PropertyList.swift	76.92%	3 Missing ⚠️
Sources/OpenSwiftUICore/Graph/GraphReuse.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #953      +/-   ##
==========================================
+ Coverage   26.56%   26.63%   +0.06%     
==========================================
  Files         732      732              
  Lines       52699    52700       +1     
==========================================
+ Hits        14002    14037      +35     
+ Misses      38697    38663      -34     

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🤖 Augment PR Summary

Summary: Fixes PropertyList lookup/mutation and comparison semantics.
Changes:

• Wrap setter-side lookup in withExtendedLifetime so elements remain alive during find/valuesEqual.
• Change mayNotBeEqual(..., ignoredTypes:) to take ignored types by value and copy internally to avoid mutating caller-owned arrays.
• Tighten PropertyList.Element implementation visibility with fileprivate members.
• Add core + symbol-dual tests asserting ignored-type lists are preserved across comparisons.

Notes: Prevents equality checks from inadvertently affecting reuse logic that relies on the original ignored-types array.

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