chore: incoming 1640 changelog entry

Author: Changelog Bot

cmd/generate_changelog/incoming/1640.txt

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+### PR [#1640](https://github.com/danielmiessler/Fabric/pull/1640) by [ksylvan](https://github.com/ksylvan): Implement Automated Changelog System for CI/CD Integration
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+- Add automated changelog processing for CI/CD integration with comprehensive test coverage and GitHub client validation methods
+- Implement release aggregation for incoming files with git operations for staging changes and support for version detection from nix files
+- Change push behavior from opt-out to opt-in with GitHub token authentication and automatic repository detection
+- Enhance changelog generation to avoid duplicate commit entries by extracting PR numbers and filtering commits already included via PR files
+- Add version parameter requirement for PR processing with commit SHA tracking to prevent duplicate entries and improve formatting consistency