deps: Bump xunit.runner.visualstudio from 3.1.5 to 4.0.0

[dependabot]

Updated xunit.runner.visualstudio from 3.1.5 to 4.0.0.

Release notes

Sourced from xunit.runner.visualstudio's releases.

4.0.0

Release notes: https://xunit.net/releases/visualstudio/4.0.0

4.0.0-pre.5

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.5

4.0.0-pre.4

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.4

4.0.0-pre.3

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.3

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[github-actions]

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[github-actions]

👋 Friendly nudge — this PR has had no activity for 7 days.

What needs attention:

• 👀 No approving reviews yet. Request a review from a teammate.

---

If this PR is abandoned, please close it. If it's blocked on something external, leave a comment so the team knows.
This is an automated check that runs on weekdays. It won't nudge the same PR more than once per week.

[DeDuva]

Not merged — human review (major) (head 0fd56e87)

• Change: xunit.runner.visualstudio 3.1.5 → 4.0.0, in test/Squad.Agents.AI.Tests/Squad.Agents.AI.Tests.csproj. One file, one PackageReference version attribute — scope is clean.
• CI evidence: strong, and unusually direct for a major. .NET ubuntu-latest and .NET windows-latest both SUCCESS, and that workflow ends in dotnet test test/Squad.Agents.AI.Tests/... --no-build -c Release --logger trx, so the new runner adapter actually executed this repository's test suite on both platforms rather than merely being restored. claude-md and changes also pass; mergeable: true, mergeStateStatus: clean; no FAILURE, CANCELLED, or pending checks.
• Local validation: unavailable. dotnet is not installed on this runner, so this PR rests entirely on the CI evidence above — nothing was verified locally.
• Why it is not auto-merged: it is a major, and a major needs positive evidence that its breaking changes were examined and none apply here. The PR body links the 4.0.0 release notes rather than inlining them (https://xunit.net/releases/visualstudio/4.0.0), and the 3.1.5 → 4.0.0 range crosses four pre-releases, so this run could not establish what changed. Green checks are necessary but not sufficient for that judgement.
• What a human should check: the 4.0.0 release notes for changes to the VSTest adapter contract and to the minimum xunit.v3 / Microsoft.NET.Test.Sdk versions it expects — the latter interacts with deps: Bump Microsoft.NET.Test.Sdk from 17.14.1 to 18.9.0 #125, which bumps Microsoft.NET.Test.Sdk in the same project. Also worth confirming that TRX logger output still lands where squad-agents-ai-ci.yml expects (--results-directory TestResults), since a silently empty result set would still look green.

This is the strongest remaining candidate in the queue. It was not merged this run only because the 3-merge cap was already spent on #131, #129, and #90.

[DeDuva]

Merging as part of a manual queue cleanup ahead of the weekly automation.

xunit.runner.visualstudio 3.1.5 → 4.0.0 is a major, confined to test/Squad.Agents.AI.Tests. Same reasoning as #125: both .NET jobs run dotnet test against this csproj and both are green, and for a test runner a green suite is the direct exercise of the thing being upgraded — if v4 could not discover or execute these tests, the job would not have reported success.

No local validation — dotnet is not installed on this machine.