docs: enhance config module documentation

Add clarification about configurable security levels and processing settings
in the config module docstring.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: catinspace-au

src/logreducer/config.py

@@ -1,5 +1,7 @@
 """
 Configuration and tuning parameters for LogReducer
+
+This module provides configurable security levels and processing settings.
 """
 
 import multiprocessing as mp