chore(ci): rename codeql2.yml to codeql.yml for clarity

[Copilot]

Description

Addresses feedback on PR #95: renames .github/workflows/codeql2.yml to .github/workflows/codeql.yml. The "2" suffix was misleading as there is only one CodeQL workflow in the repository.

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 (updates to README, docstrings, etc.)
• Refactoring (no functional changes, just code improvements)
• Test updates (adding or updating tests)

Related Issues

Related to #95

Testing

• I have tested this change locally
• I have added tests that prove my fix is effective or that my feature works
• All existing tests pass (cargo test)
• I have run the quality assurance checks (just qa)
• I have run clippy with strict warnings (cargo clippy -- -D warnings)
• Code is properly formatted (cargo fmt --check)

Checklist

• My code follows the project's style guidelines
• 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

Screenshots (if applicable)

N/A - Workflow file rename only.

Additional Notes

This is a stacked PR that merges into #95. File rename only, no functional changes to the workflow configuration.

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