chore: incoming 1640 changelog entry

Author: Changelog Bot

cmd/generate_changelog/incoming/1640.txt

@@ -0,0 +1,7 @@
+### PR [#1640](https://github.com/danielmiessler/Fabric/pull/1640) by [ksylvan](https://github.com/ksylvan): Implement Automated Changelog System for CI/CD Integration
+
+- Add automated changelog processing for CI/CD integration with comprehensive test coverage
+- Implement release aggregation for incoming files and git operations for staging changes
+- Change push behavior from opt-out to opt-in with GitHub token authentication
+- Add command flags for PR processing with improved CLI error handling and git status validation
+- Fix PR#.txt file formatting to ensure proper newline termination