chore: sync generated code with sdk-generator

[SoulPancake]

Description

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References

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

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📥 Commits

Reviewing files that changed from the base of the PR and between d204c77 and 12754b7.

📒 Files selected for processing (7)

• README.md
• src/OpenFga.Sdk/Constants/FgaConstants.cs
• src/OpenFga.Sdk/Model/CreateStoreResponse.cs
• src/OpenFga.Sdk/Model/GetStoreResponse.cs
• src/OpenFga.Sdk/Model/Store.cs
• src/OpenFga.Sdk/Model/Tuple.cs
• src/OpenFga.Sdk/Model/TupleChange.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/generator-sync

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[Copilot]

Pull request overview

This PR synchronizes generated .NET SDK artifacts with the current sdk-generator output, updating generated model code and a small set of constants/docs to match the latest generated state.

Changes:

• Updates TupleChange equality/hash logic around Timestamp.
• Updates the SDK UserAgent constant to be derived from SdkVersion.
• Applies minor README formatting/whitespace adjustments in examples.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/OpenFga.Sdk/Model/TupleChange.cs	Regenerated equality/hash logic for Timestamp in the model.
src/OpenFga.Sdk/Constants/FgaConstants.cs	Makes UserAgent derive from SdkVersion instead of hardcoding the full string.
README.md	Minor whitespace/formatting adjustments in code snippets/sections.

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