Photo Hassan Khomeini, right, the grandson of Ayatollah Ruhollah Khomeini, registering in Tehran in December to take part in the election for the Assembly of Experts, the clerical body that chooses Iran’s supreme leader. Credit Fatemeh Bahrami/Anadolu Agency, via Getty Images TEHRAN — After months of political maneuvering, the scion of the powerful Khomeini family and the projected figurehead of Iran ’s ailing reform movement was definitively barred Wednesday from participating in parliamentary elections this month, the semiofficial news agency ILNA reported. Hassan Khomeini, 43, a Shiite Muslim cleric like his grandfather, Ayatollah Ruhollah Khomeini, the founder of the Islamic Republic, lost his appeal before the Guardian Council, a powerful vetting group dominated by hard-liners. Mr. Khomeini was among the thousands of candidates, most of them reformists, who were barred from the parliamentary elections and from the vote for the 88-member Assembly of Experts, which is charged with electing […]