chore: add CI workflows for build/test and example run

[Garfield550]

Summary

• add a Build and Test workflow for restore/build/test on .NET 10
• add a Run Example workflow to execute the sample app on CI

Validation

• local build: dotnet build Eventa.slnx --configuration Release --no-restore

[Copilot]

Pull request overview

Adds GitHub Actions CI workflows to restore/build/test the solution and to run the example app, while also tightening invoke/stream cancellation behavior and enabling NuGet lock files for some projects to support --locked-mode restores.

Changes:

• Add two CI workflows: “Build and Test” and “Run Example” targeting .NET 10.
• Enable NuGet lock-file restores for the test and example projects and commit their packages.lock.json.
• Adjust invoke session/request-stream cancellation behavior and update stream tests accordingly.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
.github/workflows/build-test.yml	New CI workflow to restore/build/test on PRs and pushes to main.
.github/workflows/run-example.yml	New CI workflow to restore and run the example app on PRs and pushes to main.
tests/Eventa.Tests/Eventa.Tests.csproj	Enables lock file restore for tests.
tests/Eventa.Tests/packages.lock.json	Adds NuGet lock file for tests.
tests/Eventa.Tests/StreamTests.cs	Updates cancellation assertion mechanics for a request-stream abort test.
examples/Eventa.Example/Eventa.Example.csproj	Enables lock file restore for the example project.
examples/Eventa.Example/packages.lock.json	Adds NuGet lock file for the example project.
src/Eventa/Support/InvokeSessionEngine.cs	Changes request dispatch scheduling to respect request cancellation token.
src/Eventa/Support/InvokeHandlerRegistrationFactory.cs	Adds cancellation propagation to handler response stream enumeration.

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