Is a soaker hose safe for drinking-water-adjacent use (vegetable gardens, foundation watering)?

Only some are. Water Right markets its polyurethane soaker as lead, BPA, and phthalate-free and drinking-water safe, and r/moderatelygranolamoms threads single it out for non-toxic gardening. Most recycled-rubber soakers do not carry that certification, so check the spec sheet if you're watering edibles.