[claude] Add module docstrings to 9 undocumented files (#1296) (#1302)

Co-authored-by: Claude (Opus 4.6) <claude@hermes.local>
Co-committed-by: Claude (Opus 4.6) <claude@hermes.local>

src/config.py

@@ -1,3 +1,8 @@
+"""Central pydantic-settings configuration for Timmy Time Dashboard.
+
+All environment variable access goes through the ``settings`` singleton
+exported from this module — never use ``os.environ.get()`` in app code.
+"""
 import logging as _logging
 import os
 import sys