docs: add mannietech15 as a contributor for code

[allcontributors]

Adds @mannietech15 as a contributor for code.

This was requested by ashrafchowdury in this comment

[skip ci]

[vercel]

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Error		Aug 11, 2026 12:16pm

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ mmabrouk
❌ allcontributors[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}