CAIRO — Samera al-Huri’s fellow activists were disappearing, one by one. “This is the darkest age for Yemeni women,” said Rasha Jarhum, founder of the Peace Track Initiative, which lobbies for women’s inclusion in peace talks between the Houthis and Yemen’s internationally recognized government. Al-Huri said when she rejected a Houthi official’s request to snitch on other activists, she was …