Add .mailmap for contributor identity mapping

[Copilot]

Adds .mailmap file to establish canonical contributor identities in Git metadata.

Changes

• Created .mailmap with entry for Mohamad Gebai
• Documented standard mailmap format for future additions

The .mailmap file is Git's native mechanism for consolidating author identities across commits, affecting git shortlog, git blame, and GitHub's contributor graphs.

Code-Reviewer Section

The general pull request guidelines can be found here.

Please check each of the following things and check all boxes before accepting a PR.

• The PR has a description, explaining both the problem and the solution.
• The description mentions which forms of testing were done and the testing seems reasonable.
• Every function/class/actor that was touched is reasonably well documented.

For Release-Branches

If this PR is made against a release-branch, please also check the following:

• This change/bugfix is a cherry-pick from the next younger branch (younger release-branch or main if this is the youngest branch)
• There is a good reason why this PR needs to go into a release branch and this reason is documented (either in the description above or in a linked GitHub issue)

Original prompt

mohamad gebai

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