ci: restore linux job names and set PYTHONPATH=src (keep windows optional)

Author: CoderDeltaLAN

.github/workflows/ci.yml

@@ -13,13 +13,15 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  python:
-    if: ${{ (github.event_name == 'push' && startsWith(github.ref,'refs/heads/main')) || (github.event_name == 'pull_request' && github.event.pull_request.draft == false && contains(github.event.pull_request.labels.*.name,'ready')) }}
+  linux:
+    name: linux (py=${{ matrix.python-version }})
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.11','3.12']
+        python-version: ["3.11","3.12"]
+    env:
+      PYTHONPATH: src
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -31,3 +33,21 @@ jobs:
       - run: black --check .
       - run: pytest -q
       - run: mypy .
+
+  windows_optional:
+    name: windows (optional)
+    runs-on: windows-latest
+    continue-on-error: true
+    env:
+      PYTHONPATH: src
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: python -m pip install -U pip
+      - run: pip install ruff black pytest mypy
+      - run: ruff check .
+      - run: black --check .
+      - run: pytest -q
+      - run: mypy .