chore: update CHANGELOG.md for v0.13.1 release

Add changelog entry for v0.13.1 patch release documenting:
- Fixed CLI project management commands (#129)
- Resolved case sensitivity issues in project switching (#127)
- API endpoint standardization and improved error handling
- Consistent project name handling using permalinks

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Co-Authored-By: Claude <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,20 @@
 # CHANGELOG
 
+## v0.13.1 (2025-06-11)
+
+### Bug Fixes
+
+- **CLI**: Fixed  `basic-memory project` project management commands that were  not working in v0.13.0 (#129)
+- **Projects**: Resolved case sensitivity issues when switching between projects that caused "Project not found" errors (#127)
+- **API**: Standardized CLI project command endpoints and improved error handling
+- **Core**: Implemented consistent project name handling using permalinks to avoid case-related conflicts
+
+### Changes
+
+- Renamed `basic-memory project sync` command to `basic-memory project sync-config` for clarity
+- Improved project switching reliability across different case variations
+- Removed redundant server status messages from CLI error outputs
+
 ## v0.13.0 (2025-06-11)
 
 ### Overview