In a nation where energy infrastructure has become a symbol of both stability and vulnerability, a 48-year-old man was arrested Tuesday near a German power plant carrying explosives, bringing a multi-state manhunt to a close. Across Brandenburg, Saxony, and North Rhine-Westphalia, a methodical campaign of sabotage had targeted high-voltage lines using rockets and wire — a technique as technically deliberate as it was alarming. The suspect had written to newspapers claiming responsibility before authorities could even name the incidents publicly, raising questions not only about motive but abou