fix(ci): add sqlalchemy to pip install step (closes #293)

test_audit_ledger.py imports sqlalchemy directly. While sqlalchemy
is declared in workspace/requirements.txt, add it explicitly to the
pip install step to ensure CI collects this test reliably even if
requirements.txt has parsing issues.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -365,7 +365,7 @@ jobs:
           cache: pip
           cache-dependency-path: workspace/requirements.txt
       - if: needs.changes.outputs.python == 'true'
-        run: pip install -r requirements.txt pytest pytest-asyncio pytest-cov
+        run: pip install -r requirements.txt pytest pytest-asyncio pytest-cov sqlalchemy
       # Coverage flags + fail-under floor moved into workspace/pytest.ini
       # (issue #1817) so local `pytest` and CI use identical config.
       - if: needs.changes.outputs.python == 'true'