Suspended LAUSD boss Alberto Carvalho has been spotted for the first time in nearly three months — as he spends his days pacing around the courtyard of his California home while collecting tens of thousands in taxpayers’ cash. The schools boss, who has earned about $90,000 since the FBI raided his homes and offices in February, is living a low-key life in isolation at his $2.5 million San Pedro house, the California Post can reveal. The 61-year-old was seen doing laps of his rooftop yard over three days last week before briefly breaking cover for an incognito shopping trip with his wife, Maria. LAUSD boss Alberto Carvalho has been spotted for the first time in nearly three months — as he spends his days pacing around the courtyard of his California home while still collecting tens of thousands in taxpayers’ cash.…