CDT.NET: Full ReadOnlySpan<T> input migration + round 2 performance optimizations#8

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Copilot wants to merge 6 commits intomainfrom

copilot/replace-ireadonlylist-with-readonlyspan

Commits on Feb 22, 2026

Initial plan
Copilot
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Fix test compilation errors after ReadOnlySpan<T> API changes

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Copilot
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Extract FixedEdgeSet property to reduce duplication in frozen set lookups

Copilot
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MichaConrad
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Fix KD-tree test allocations, FreezeFixedEdges doc/invalidation, and FixedEdgeSet dispatch

Copilot
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MichaConrad
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Fix viz app build errors: use CollectionsMarshal.AsSpan for List-to-span conversions

Copilot
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MichaConrad
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Fix benchmark build: BenchmarkInputReader.Read returns arrays, update field types

Copilot
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MichaConrad
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