docs: add MarceloAdan73 as a contributor for code

[allcontributors]

Adds @MarceloAdan73 as a contributor for code.

This was requested by mmabrouk in this comment

[skip ci]

[vercel]

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Ready	Preview	Aug 3, 2026 7:15am

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}