test(coverage): restore the ratchet under Coverlet 10

[ooples]

Root cause

Dependabot PR #8 upgraded coverlet.collector from 6.0.4 to 10.0.1 and was merged while its coverage gate was red. The package source and test set are unchanged, but Coverlet 10 no longer falsely credits several short-circuit outcomes:

Controlled run	Covered branches	Branch coverage
Coverlet 6.0.4 + Test SDK 17.14.1	3111 / 4131	75.30%
Coverlet 10.0.1 + Test SDK 17.14.1	3029 / 4131	73.32%
Coverlet 6.0.4 + Test SDK 18.9.0	3111 / 4131	75.30%
Current main (Coverlet 10.0.1 + Test SDK 18.9.0)	3029 / 4131	73.32%

That isolates the change to Coverlet, not the test SDK and not product-code regression. Line coverage remained exactly 88.93% in every run.

Fix

• retain Coverlet 10's .NET 10 support and more accurate branch semantics
• exercise real non-finite, upper-bound, empty-archive, identity-mismatch, direction-mismatch, and retention-boundary behavior
• keep the existing baseline and tolerance unchanged
• do not manufacture the unreachable Completed-with-null-quality archive case; EvolutionEvaluation correctly refuses that invalid object first

Before / after proof

• before: 275/275 tests pass, but 3029/4131 branches = 73.32%; ratchet fails at minimum 73.51%
• after: 276/276 tests pass, 3041/4131 branches = 73.61%; ratchet passes
• net8.0: 276/276 passed
• net471: 276/276 passed
• all package TFMs built with 0 warnings / 0 errors
• package pack and eng/Test-Package.ps1: passed
• dotnet format --verify-no-changes: passed
• git diff --check: passed

This PR restores main's currently broken required build without reducing the coverage requirement.

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📥 Commits

Reviewing files that changed from the base of the PR and between a924578 and cbe9a7a.

📒 Files selected for processing (6)

• tests/AiDotNet.Evolution.Tests/UnitTests/EvolutionCoreParityTests.cs
• tests/AiDotNet.Evolution.Tests/UnitTests/EvolutionDescriptorCalibrationTests.cs
• tests/AiDotNet.Evolution.Tests/UnitTests/EvolutionMigrationTopologyTests.cs
• tests/AiDotNet.Evolution.Tests/UnitTests/EvolutionPublicContractTests.cs
• tests/AiDotNet.Evolution.Tests/UnitTests/EvolutionSelectionPolicyTests.cs
• tests/AiDotNet.Evolution.Tests/UnitTests/MapElitesArchiveTests.cs

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