feat(dev-session): Containerize dev session manager

This commit introduces a containerized workflow for the development session manager (dev_session.py).

- Dockerization: Added gemini.Dockerfile to create a self-contained environment with all Python dependencies, removing the need for manual host setup.
- Start Script: Updated start-gemini.sh to build and run the container, executing dev_session.py as the entrypoint.
- Session Management: Implemented --done flag to properly terminate a session, update the Notion task status, and clean up the git hook.
- Notion Integration: Created and integrated notion_commit_hook.py which is automatically installed/uninstalled to post commit messages to the active Notion task.
- Documentation: Updated README_dev_session.md to reflect the new container-based setup, usage, and features.

start-gemini.sh

@@ -1,3 +1,4 @@
+
 #!/bin/sh
 
 # Sicherstellen, dass der Config-Ordner existiert, damit Docker ihn als Ordner und nicht als Datei mountet
@@ -14,4 +15,6 @@ sudo docker run -it --rm \
   -v "$(pwd):/app" \
   -v "$(pwd)/.gemini-config:/root/.config" \
   --name gemini-session \
-  gemini-dev-env
+      gemini-dev-env \
+      bash -c "python3 dev_session.py"
+