refactor(analyzers): make config hints opt-in

[thomhurst]

Summary

• disable KEV009, KEV010, and KEV011 by default while retaining Info severity when enabled
• test opt-in behavior through a parsed .editorconfig
• document strict-hint enablement and remove page-one muting guidance

Test plan

• dotnet run --project tests/Kevlar.Analyzers.Tests -c Release --no-build -- --timeout 5m (297 passed)
• dotnet build Kevlar.slnx -c Release
• pwsh scripts/Verify-DocSnippets.ps1 -PackagesPath artifacts/package/issue396 -Version 0.0.0-issue396 -NoImplicitUsings
• npm run build --prefix docs

Closes #396

[coderabbitai]

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