ci: add quality and docs envs to CI matrix

tox.ini already declared quality and docs in envlist with correct
dependency_groups, but the CI matrix only ran py. Wire them up so
pylint/pycodestyle/pydocstyle/mypy/isort and the docs build are
verified on every CI run.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: farhan

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: true
       matrix:
         python-version: ["3.12"]
-        toxenv: [py]
+        toxenv: [py, quality, docs]
 
     steps:
       - name: Checkout repository