Refactor: repo hygiene, shared utils, focused tests, and CI improvements

- Remove dead imports/duplication from Google2xls.py and social.py
- Centralize shared logic in review_workflow_utils.py
- Add focused posting-flow tests in tests/test_social.py (all pass)
- Update .gitignore for secrets and local artifacts
- Trim requirements.txt to direct deps
- Improve CI: compile all scripts, run focused tests
- Prep repo for clean commit (no secrets, no local artifacts)

.github/workflows/pylint.yml

@@ -1,23 +1,26 @@
-name: Pylint
-
-on: [push]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ["3.11"]
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install pylint
-    - name: Analysing the code with pylint
-      run: |
-         pylint $(git ls-files '*.py') --output=lint.txt || true
+name: Validate
+
+on: [push]
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install validation dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install python-dateutil selenium
+    - name: Compile core scripts
+      run: |
+        python -m py_compile Google2xls.py WP2xls.py social.py text.py review_workflow_utils.py
+    - name: Run focused unit tests
+      run: |
+        python -m unittest discover -s tests