I don't know the real reason for not have crush armor for these techonologies since we have some units like siege, slinger, maceman and now axeman in a24.
1- This patch add crush armor to 5 forge armor techs:
- armor_cav_01
- armor_cav_02
- armor_infantry_01
- armor_infantry_02
- armor_hero_01 (it will probably change soon, but it is still correct to add)
2- Renames technologies armor_cav_01 and armor_cav_02 to armor_cavalry_01 and armor_cavalry_02