Expected output (exact):
{'101': ~0.945}  (94.5% probability)

Expected output (1024 shots, approximate):
{'101': ~968, others: ~56 total}

With 3 qubits and 1 marked item, the optimal number of Grover
iterations is floor(π/4 × √8) ≈ 2.

After 2 iterations, the target state |101⟩ has ~94.5% probability.
The remaining ~5.5% is spread across the other 7 states.

A classical random search would find the target with probability 1/8
per guess, requiring on average 8 guesses.