Add Task Manager scripts (Moltbot port)

SKILL_TASK_MANAGER.md

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+# SKILL: Task Manager
+
+## Commands
+- `#task`: Start a new task session.
+  1. Run `python3 scripts/list_projects.py`
+  2. Ask user to choose project number.
+  3. Run `python3 scripts/list_tasks.py <project_id_from_selection>`
+  4. Ask user to choose task number (or 'new' for new task - not impl yet, ask for manual ID if needed).
+  5. Run `python3 scripts/select_task.py <task_id>`
+  
+- `#fertig`: Finish current task.
+  1. Ask user for short summary of work.
+  2. Run `python3 scripts/finish_task.py "<summary>"`
+  3. Ask user if they want to push (`git push`).
+
+## Notes
+- Requires `.env.notion` with `NOTION_API_KEY`.
+- Stores state in `.dev_session/SESSION_INFO`.