Is there any chiyuv in Halacha for hiddur mitzvah regarding Lechem Mishneh, or no? And if so, is the mitzvah of beautification an obligation for the bread itself (making it beautiful by braiding it) or for the plate/knife, or both?

According to Halacha, what percentage of tzedakah given should go to a baal teshuvah? Did the Chofetz Chaim give a P’sak on this?

According to Halacha, do Mikvaot (which are outdoors, not covered by a roof) require hasgacha to be presumed kosher, or do the poskim allow for a Chazakah it remains valid even without supervision? Does it depend on the rain and weather cycle of the area? Sources please