ci: add a non-blocking Windows test job (closes #3884)

[Dipak Chaudhari (dchaudhari7177)]

Closes #3884, taking the "suggested minimal step" from the issue.

Confirmed on current main

$ grep -h -oE "runs-on:.*" .github/workflows/*.yml | sort | uniq -c
      1 runs-on: ${{ matrix.os }}
      1 runs-on: ubuntu-24.04
     98 runs-on: ubuntu-latest

$ grep -riE "windows" .github/workflows/
.github/workflows/publish.yml:  - { os: windows-2022, platform: windows-x86_64, ... }

$ grep -c "runs-on" .github/workflows/ci.yml
19

One Windows runner in the repository, and it builds the win_amd64 wheel without running the suite on it. ci.yml -- the file #310's acceptance criteria named -- has no windows and no macos.

What this adds

A test-windows job that reports and cannot gate:

• continue-on-error: true
• not in ci-complete's needs list, so it is invisible to the merge gate rather than merely tolerated by it

Both are deliberate. The suite has never run on Windows, so the first run is a measurement, not a pass/fail. Promote the job once its failures are triaged.

Scope, and what is left out

Nine packages -- the ones needing neither OPA nor the native ACS Rust SDK:

agent-mesh, agent-hypervisor, agent-sre, agent-runtime, agent-lightning,
agent-primitives, agent-mcp-governance, agent-discovery, agent-rag-governance

The five ACS-backed packages (agent-os, agt-policies, agent-compliance, agent-marketplace, agent-sandbox) are excluded: they need a Windows OPA binary and a maturin build on Windows, each its own piece of work, and putting them in the first run would bury the pure-Python signal this job exists for.

One Python version (3.13) rather than the Linux job's four, since a Windows runner costs about twice a Linux one and this is a smoke signal.

Keeping it from drifting

Steps default to shell: bash, which windows-latest ships via Git for Windows, so the change-gate and install logic is the same shell as the Linux test job rather than a second PowerShell transcription that would drift from it. Actions use the same pinned SHAs already in this file.

Validation

$ python -c "yaml.safe_load(...)"          # parses; 20 jobs
  test-windows present:      True
  continue-on-error:         True
  runs-on:                   windows-latest
  in ci-complete needs:      False
  matrix packages:           9

$ actionlint .github/workflows/ci.yml      # rhysd/actionlint container
  1 finding, with this job and on main alike (a pre-existing SC2193 at
  build-pypi, line 509, untouched here)

I cannot run a GitHub Windows runner locally, so what the first run reports is genuinely unknown -- that is the point of the job, and the reason it is non-blocking. If you would rather start with a single package, or on a schedule only rather than on pull requests, say which and I will narrow it.

[azure-pipelines]

Azure Pipelines:
There may be pipelines that require an authorized user to comment /azp run to run.

[github-actions]

PR Review Summary

Check	Status	Details
🔍 Code Review	⚠️ Missing	No current-run comment
🛡️ Security Scan	⚠️ Missing	No current-run comment
🔄 Breaking Changes	⚠️ Missing	No current-run comment
📝 Docs Sync	⚠️ Missing	No current-run comment
🧪 Test Coverage	⚠️ Missing	No current-run comment

Verdict: ⚠️ AI review incomplete; ready for human review

AI review comments are untrusted advisory output. The summary reports workflow-generated completion status only, not model-authored pass/fail claims.

[github-actions]

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