fix(hedge): normalize negative delays

[thomhurst]

Summary

• normalize every negative hedge delay to Timeout.InfiniteTimeSpan
• align quick overloads and standard HTTP configuration with failure-only hedging semantics
• cover option, untyped, typed, description, and configuration paths
• document Polly parity and special delay values

Closes #438

Validation

• dotnet build Kevlar.slnx -c Release -p:Version=1.0.0-local
• dotnet run --project tests/Kevlar.Tests -c Release -f net8.0 --no-build -- --timeout 5m (1277 passed)
• dotnet run --project tests/Kevlar.Tests -c Release -f net10.0 --no-build -- --timeout 5m (1311 passed)
• dotnet run --project tests/Kevlar.IntegrationTests -c Release --no-build -- --timeout 5m (176 passed)
• pwsh scripts/Verify-Docs.ps1
• pwsh scripts/Verify-ApiDocs.ps1
• npm ci and npm run build in docs/

[coderabbitai]

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[chatgpt-codex-connector]

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