ci: add windows-latest job to empirically verify Windows code paths (#405)

Adds a windows-latest CI job that executes the real GlobalMemoryStatusEx RAM path (#373), the #293 stdout reconfigure test, and builds+imports the openjarvis_rust PyO3 extension on Windows. Verified green on a real Windows runner (4m1s, all steps success).

.github/workflows/ci.yml

@@ -80,6 +80,56 @@ jobs:
           path: coverage.xml
           if-no-files-found: warn
 
+  # Windows job — empirically exercises the platform-specific code paths that
+  # the Ubuntu `test` job can never reach: GlobalMemoryStatusEx RAM detection
+  # (#373) and the cp9xx -> UTF-8 stdout reconfigure (#293). Also the only CI
+  # job that builds + imports the mandatory `openjarvis_rust` PyO3 extension
+  # on Windows. Public repo -> Windows runner minutes are free.
+  #
+  # All `run:` steps use static commands only (no `github.event.*`
+  # interpolation), so there is no workflow-injection surface here.
+  test-windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.12"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v8.0.0
+
+      - name: Install dependencies
+        run: uv sync --extra dev --extra server
+
+      # Pure-Python check — runs before the Rust build so a flaky toolchain
+      # install can never mask the actual RAM-detection verification.
+      - name: Verify Windows RAM detection (#373)
+        shell: bash
+        run: |
+          uv run python -c "from openjarvis.core.config import _total_ram_gb; ram = _total_ram_gb(); print(f'GlobalMemoryStatusEx RAM = {ram} GB'); assert ram > 0, f'Windows RAM detection returned {ram}, expected > 0'"
+
+      - name: Run Windows-specific tests (hardware + CLI)
+        shell: bash
+        run: |
+          uv run pytest tests/hardware/test_hardware_profiles.py tests/cli/test_cli.py -v -m "not live and not cloud"
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Build + import the PyO3 extension on Windows
+        shell: bash
+        run: |
+          uv run maturin develop --manifest-path rust/crates/openjarvis-python/Cargo.toml
+          uv run python -c "import openjarvis_rust; print('openjarvis_rust imports on Windows OK')"
+
+      - name: Smoke-test CLI
+        shell: bash
+        run: |
+          uv run jarvis --version
+
   rust:
     runs-on: ubuntu-latest
     defaults: