Step 1: Know the Gaganyaan program structure.
Gaganyaan is ISRO's first human spaceflight program. Before sending astronauts (Gaganauts), ISRO plans uncrewed test missions to validate all life-support and safety systems.
Step 2: Identify the mission carrying Vyom Mitra.
Vyom Mitra is ISRO's humanoid space robot, designed to simulate human functions and monitor life-support systems during test flights. She is part of Gaganyaan-1 (G1), the uncrewed test mission planned for 2026.
Step 3: Eliminate the distractors.
Chandrayaan-4 targets the Moon, Mangalyaan-2 targets Mars, and Venus Orbiter (Shukrayaan) targets Venus. Vyom Mitra is specifically tied to the Gaganyaan human spaceflight program, not any planetary probe.
\[ \boxed{\text{Gaganyaan-1}} \]