In the ancient calculus of oil and war, Tuesday brought a familiar reckoning: West Texas Intermediate crude crossed $90 a barrel for the first time in weeks as US military strikes against Iran revived fears over the Strait of Hormuz, the narrow passage through which a fifth of the world's daily oil supply quietly flows. The immediate cause was a new round of American strikes, retaliatory in nature, and the striking of two supertankers by projectiles — a reminder that geopolitical friction rarely stays abstract for long. What began as a military confrontation in a distant waterway has already r