When Catherine Reitman yelled “wrap” on the final shot for the final episode of the final season of her comedy series, “Workin’ Moms,” this past September, she received a special parting gift that’s bestowed upon all victorious team leaders: a Gatorade shower. It was a well-deserved dousing, because what she accomplished over the last five years is arguably even rarer than a Super Bowl victory: she created, wrote and starred in a homegrown CBC sitcom that – thanks to a 2019 Netflix acquisition – found a large, loyal following and critical acclaim on both sides of the border. But as...