feat(di): add typed shield provider parity

[thomhurst]

Summary

• add IShieldProvider<TResult> plus typed configuration and reload-aware DI registrations
• expose typed providers through keyed DI and the registry while preserving immutable keyed snapshots
• make StandardHttpShieldOptions.CircuitBreaker result-aware and preserve HandlesResult overrides
• document the API symmetry and add reload, state-reset, registry, configuration, and HTTP breaker regression coverage

Motivation

The DI surface exposed configuration and reload support only for untyped shields, while standard HTTP configuration erased result predicates from its circuit breaker. This restores typed/untyped parity without resurrecting the removed VoidShield shape.

Validation

• dotnet build Kevlar.slnx -c Release -t:Rebuild -p:Version=1.1.0-issue212 -p:CI=true
• dotnet run --project tests/Kevlar.Tests -f net8.0 -c Release --no-build -- --timeout 5m (928 passed)
• dotnet run --project tests/Kevlar.Tests -f net10.0 -c Release --no-build -- --timeout 5m (953 passed)
• dotnet run --project tests/Kevlar.IntegrationTests -c Release --no-build -- --timeout 5m (150 passed)
• pwsh scripts/Verify-Docs.ps1 (27 pages)
• pwsh scripts/Verify-DocSnippets.ps1 -PackagesPath artifacts/packages-issue212-d396629 -Version 1.1.0-issue212 (154 snippets)
• npm run build from docs/
• pwsh scripts/Verify-Packages.ps1 -PackagesPath artifacts/packages-issue212-d396629 -Version 1.1.0-issue212

Closes #212

[coderabbitai]

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