During the offseason, when they began their massive rebuilding, the 49ers’ catchphrase was clear: brick by brick. During the regular season, in which they’ve lost three games by a combined eight points, those words have been shoved aside for these: the moment of truth. After a 12-9 loss in Seattle, head coach Kyle Shanahan invoked them when discussing a failed final drive: “In the moment of truth,” he said, “we didn’t get it done in the passing game.” After an 18-15 overtime loss in Arizona, Shanahan said the 49ers needed to discover why they weren’t making plays “in the moment of truth.” On Wednesday, Shanahan said it again.