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.

notion_commit_hook.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+import os
+import sys
+import json
+import subprocess
+
+# Fügen Sie das Hauptverzeichnis zum Python-Pfad hinzu, damit wir dev_session importieren können
+sys.path.append(os.path.dirname(os.path.abspath(__file__)))
+
+try:
+    from dev_session import add_comment_to_notion_task
+except ImportError:
+    print("Fehler: Konnte dev_session.py nicht importieren.", file=sys.stderr)
+    sys.exit(1)
+
+SESSION_DIR = ".dev_session"
+SESSION_FILE_PATH = os.path.join(SESSION_DIR, "SESSION_INFO")
+
+def get_last_commit_message() -> str:
+    """Holt die letzte Commit-Nachricht mit git."""
+    try:
+        # Führt 'git log -1 --pretty=%B' aus, um die vollständige Commit-Nachricht zu erhalten
+        result = subprocess.run(
+            ["git", "log", "-1", "--pretty=%B"],
+            capture_output=True,
+            text=True,
+            check=True
+        )
+        return result.stdout.strip()
+    except (subprocess.CalledProcessError, FileNotFoundError):
+        return ""
+
+def main():
+    """Hauptfunktion des Git-Hooks."""
+    # Führe den Hook nur aus, wenn eine aktive Session existiert
+    if not os.path.exists(SESSION_FILE_PATH):
+        sys.exit(0)
+
+    try:
+        with open(SESSION_FILE_PATH, "r") as f:
+            session_data = json.load(f)
+        
+        task_id = session_data.get("task_id")
+        token = session_data.get("token")
+
+        if not task_id or not token:
+            sys.exit(0)
+
+        commit_message = get_last_commit_message()
+
+        if commit_message:
+            # Formatieren der Nachricht für Notion
+            comment = f"✅ New Commit:\n---\n{commit_message}"
+            add_comment_to_notion_task(token, task_id, comment)
+
+    except (FileNotFoundError, json.JSONDecodeError):
+        # Wenn die Datei nicht existiert oder fehlerhaft ist, einfach beenden
+        sys.exit(0)
+
+if __name__ == "__main__":
+    main()