Publish SimpleModule.Tests.Shared (or extract a SimpleModule.Testing package) to NuGet

[antosubash]

tests/SimpleModule.Tests.Shared/ contains exactly the helpers a consumer needs to write integration tests with auth:

• SimpleModuleWebApplicationFactory : WebApplicationFactory<TProgram>
• TestAuthHandler — header-based test auth (reads X-Test-Claims)
• CreateAuthenticatedClient(string[] permissions, params Claim[] claims) and CreateAuthenticatedClient(params Claim[] claims)

But it's not packed/published — no simplemodule.tests.shared exists on NuGet (verified via nuget.org flatcontainer). Consumers either:

1. Copy the file out of the framework repo (and drift from upstream improvements), or
2. Reinvent TestAuthHandler from scratch (loses the tenant_id claim conventions, etc.)

Fix

• Set IsPackable=true on the project (currently false)
• Add it to the release workflow's pack pass
• Publish to NuGet alongside other 0.0.x bumps

Could also be re-named SimpleModule.Testing if the Tests.Shared name implies "internal" too strongly.

[antosubash]

Resolved by #104 and the framework reorganisation that followed.

framework/SimpleModule.Testing/ now hosts TestAuthHandler, TestAuthDefaults, AddTestAuthentication(), and the CreateAuthenticatedClient extensions on WebApplicationFactory<TEntryPoint>. It is part of the framework/ folder, which inherits IsPackable=true from framework/Directory.Build.props, and is included in SimpleModule.slnx, so the dotnet pack step in .github/workflows/release.yml ships it to NuGet alongside every other framework package.

tests/SimpleModule.Tests.Shared/ remains for repo-internal test fixtures only.

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