chore: update version to 0.13.6 for v0.13.6 release

Author: phernandez

src/basic_memory/__init__.py

@@ -1,7 +1,7 @@
 """basic-memory - Local-first knowledge management combining Zettelkasten with knowledge graphs"""
 
 # Package version - updated by release automation
-__version__ = "0.13.5"
+__version__ = "0.13.6"
 
 # API version for FastAPI - independent of package version
 __api_version__ = "v0"