[Repo Assist] eng: add global.json to pin .NET SDK to 10.0.x

[github-actions]

🤖 This is an automated pull request from Repo Assist.

Summary

Adds a global.json at the repository root to pin the .NET SDK to 10.0.x.

Problem

Without a global.json, any .NET SDK version installed on the machine is used. This creates two risks:

1. Version drift between machines — a developer on SDK 10.0.200 and CI on 10.0.102 may see different compiler diagnostics or NuGet resolution.
2. Accidental forward jumps — once .NET 11 SDKs are installed, builds silently switch to .NET 11 without anyone noticing.

Fix

{
  "sdk": {
    "version": "10.0.102",
    "rollForward": "latestFeature"
  }
}

rollForward: latestFeature means:

• ✅ Patch updates (10.0.103, 10.0.200) are accepted automatically
• ✅ Feature bands within .NET 10 (10.0.200, 10.0.300) are accepted
• ❌ A jump to .NET 11 requires an explicit update — intentional breakage prevention

Tracking

This resolves the proposals in issues #106 and #116, which were filed when the automated PR creation was blocked by the repository's protected-files policy for global.json.

Test Status

✅ All 503 shared tests pass, 18 skipped (Windows-only infrastructure): dotnet test tests/OpenClaw.Shared.Tests/
✅ All 93 tray tests pass: dotnet test tests/OpenClaw.Tray.Tests/
✅ CI already uses dotnet-version: 10.0.x — no workflow changes required

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Warning

🛡️ Protected Files

This was originally intended as a pull request, but the patch modifies protected files: global.json.

These files may affect project dependencies, CI/CD pipelines, or agent behaviour. Please review the changes carefully before creating the pull request.

Click here to create the pull request once you have reviewed the changes

To route changes like this to a review issue instead of blocking, configure protected-files: fallback-to-issue in your workflow configuration.