docs: require explicit DI imports in snippets

[thomhurst]

Summary

• fix README AddStandardShield namespace import
• remove hidden DI import from snippet verifier
• add explicit DI imports to affected documentation fences

Test plan

• dotnet build Kevlar.slnx -c Release -p:Version=0.0.398
• pwsh scripts/Verify-DocSnippets.ps1 -PackagesPath artifacts/package/release -Version 0.0.398 -NoImplicitUsings
• pwsh scripts/Verify-Docs.ps1
• npm run build --prefix docs

Closes #398

[coderabbitai]

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