Remove redundant auto-merge workflow

[Copilot]

Description

Removes the auto-merge workflow and all associated references from documentation and configuration.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Dependency update
• CI/CD update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Testing

No tests required - workflow configuration and documentation changes only. Verified all references removed via grep across codebase.

Screenshots (if applicable)

N/A

Additional Notes

Files changed:

• Deleted: .github/workflows/auto-merge.yml (152 lines)
• Updated: .github/labels.yml, README.md, CI_CD.md, CHANGELOG.md

Impact: 201 deletions, 6 insertions. Remaining workflows (test, release, lint, codeql, labeler) unaffected.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature]: remove auto-merge workflow in this repo</issue_title>
<issue_description>### Is your feature request related to a problem?

There is a redundant workflow called auto merge that doesn't really do anything

Describe the solution you'd like

Remove the auto-merge workflow

Describe alternatives you've considered

No response

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature]: remove auto-merge workflow in this repo #30

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