first commit

backend/app/repositories/native/editor_sessions.py

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+from __future__ import annotations
+
+from app.domain.editor import EditorSession
+
+
+class EditorSessionRepository:
+    """Temporary in-memory repository for editor sessions."""
+
+    _sessions: dict[str, EditorSession] = {}
+
+    async def create(self, session: EditorSession) -> EditorSession:
+        self._sessions[session.id] = session
+        return session
+
+    async def get(self, session_id: str) -> EditorSession | None:
+        return self._sessions.get(session_id)
+
+    async def update(self, session: EditorSession) -> EditorSession:
+        self._sessions[session.id] = session
+        return session
+
+    async def delete(self, session_id: str) -> None:
+        self._sessions.pop(session_id, None)
+