In connected «وَاسْتَغْفِرْهُ», how is its initial hamzah treated?

Al-Kāfirūn and An-Naṣr: Applied Madd, Idghām, Ghunnah and Waqf

• Hamzat qaṭʿ, always sounded
• Hamzat waṣl, not separately sounded after wāw
• Produces madd lāzim
• Merges into tanwīn