Add fetch_evening_tasks.py script and shared notion_helpers module

Refactors weekly-template's Notion client setup into a shared helper
(with .env/dotenv support and full pagination), and adds a dedicated
evening-prep script so both commands can fall back to script-based
fetching instead of the MCP search/fetch pattern.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

@@ -46,3 +46,7 @@ Temporary Items
 
 # Environment
 .env
+
+# Python
+__pycache__/
+*.pyc