There’s optimism in Beantown: “The good news, according to Ainge, is that the Celtics forward ‘should be 100 percent by the time we start training camp.’ The date for Garnett’s return to the practice floor is a tad hazier. ‘I don’t have that date,’ said Ainge, the Celtics general manager. ‘I’m actually meeting with my medical staff (today) to get some updates. But the last (update) I got before the weekend was that he’s doing great.’”