Add fellow Mykyta Spitsyn 2026 (#2878)

* Added md file

* Added photo

* style: pre-commit fixes

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: raven1423

_fellows/2026/raven1423.md

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+---
+layout: fellow
+pagetype: fellow
+shortname: raven1423
+permalink: /fellows/raven1423.html
+fellow-name: Mykyta Spitsyn
+title: Mykyta Spitsyn - IRIS-HEP Fellow
+active: True
+dates:
+  start: 2026-07-01
+  end: 2026-10-01
+photo: /assets/images/team/fellows-2026/Mykyta-Spitsyn.jpg
+institution: Taras Shevchenko National University of Kyiv
+e-mail: snv3828@gmail.com
+focus-area: ia
+challenge-area:
+project_title: Kinematic Reconstruction of Top Quarks Using CMS Open Data
+project_goal: >
+    This project develops a generic machine-learning-based framework for the kinematic
+    reconstruction of top-quark pairs in the dilepton decay channel. Building on
+    the algorithmic baseline, it explores different NN architectures, validating them using publicly
+    available CMS Open Data. The ultimate goal is a robust, reusable reconstruction approach
+    suitable for future LHC analyses and differential cross-section measurements for ttbar.
+mentors:
+  - Oleksandr Zenaiev (Hamburg University)
+proposal: /assets/pdf/fellows-2026/UKR003-proposal-Spitsyn-Mykyta.pdf
+presentations:
+current_status:
+github-username: raven1423
+linkedin-profile: https://www.linkedin.com/in/mykyta-spitsyn-b8a163389/
+---