Samsung Electronics Co. and Texas Instruments Inc. completed final agreements to get billions of dollars of government support for new semiconductor plants in the US, cementing a major piece of the Biden administration’s Chips Act initiative. Under binding agreements unveiled Friday, Samsung will get as much as $4.75 billion in funding and Texas Instruments stands to receive $1.6 billion — money that will help them build facilities in Texas and Utah. The final deals mean the chipmakers can begin...