If you were often outdoors as a child in the summers, you likely remember a series of keen sensations: having your palms licked by blades of grass, the soft scrape of tree bark against flesh, sinking fingers into soil. Memories of aimless warm days in July might conjure a sense of unblemished bliss. But in Janet Planet, Pulitzer Prize-winning playwright Annie Baker’s 1991-set debut feature film, these lilting moments are complicated with one child’s formative, tender bummer summer.