fix(handling): exclude fail-fast errors

[thomhurst]

Closes #215.

What changed

• exclude cancellation, circuit/rate/concurrency rejections, and fatal runtime exceptions from default reactive handling
• preserve explicit opt-in clauses and ordinary/programming-error compatibility
• add KEV011 informational guidance for implicit default handling
• extend deterministic retry model and runtime/analyzer regression coverage
• document the exact default and Polly migration difference

Depends on #258.

Validation

• dotnet build Kevlar.slnx -c Release
• dotnet run --project tests/Kevlar.Tests -c Release --no-build -- --timeout 5m (851 passed)
• dotnet run --project tests/Kevlar.IntegrationTests -c Release --no-build -- --timeout 5m (131 passed)
• dotnet run --project tests/Kevlar.Analyzers.Tests -c Release --no-build -- --timeout 5m (81 passed)
• pwsh scripts/Verify-Docs.ps1
• pwsh scripts/Verify-DocSnippets.ps1 -PackagesPath artifacts/package/release -Version 0.0.0-issue215 (122 snippets)
• npm run build

Benchmark

RetryBenchmarks.Kevlar_Recovery ShortRun: 2.213 us / 192 B before; 2.093 us / 192 B after.

[coderabbitai]

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[chatgpt-codex-connector]

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