The U.S. government's lead civilian cyber agency is heading into the AI era with shrinking resources and a diminished role as Washington scrambles to assemble a multi-agency response to emerging AI cyber threats. Why it matters: Former officials and industry leaders fear the Cybersecurity and Infrastructure Security Agency no longer has the capacity to help utilities, banks and other critical infrastructure operators prepare for a coming wave of AI-fueled cyberattacks. The agency is at its weakest just when it's needed most, as the government braces for AI models like Anthropic's Mythos to supercharge cyberattacks. Created in 2018 during Trump's first administration, CISA oversees efforts to protect federal systems and U.S. critical infrastructure like the power grid and water utilities from hackers. Between the lines: CISA's sidelining started from the top.…