Looking over the error log, there seems to be an issue with what was done to the raw/objects/creatures_domestic.text
Specifically, the whole thing reads as a problem with dogs.
Here's the log:
*** Error(s) found in the file "raw/objects/creature_domestic.txt"
DOG:Body Token Recognized But Could Not Connect: QUADRUPED_JOINTS
DOG:Body Token Recognized But Could Not Connect: TAIL
DOG:Body Token Recognized But Could Not Connect: 2EYES
DOG:Body Token Recognized But Could Not Connect: 2EARS
DOG:Body Token Recognized But Could Not Connect: NOSE
DOG:Body Token Recognized But Could Not Connect: 2LUNGS
DOG:Body Token Recognized But Could Not Connect: HEART
DOG:Body Token Recognized But Could Not Connect: GUTS
DOG:Body Token Recognized But Could Not Connect: ORGANS
DOG:Body Token Recognized But Could Not Connect: THROAT
DOG:Body Token Recognized But Could Not Connect: NECK
DOG:Body Token Recognized But Could Not Connect: SPINE
DOG:Body Token Recognized But Could Not Connect: BRAIN
DOG:Body Token Recognized But Could Not Connect: SKULL
DOG:Body Token Recognized But Could Not Connect: 4TOES_FQ
DOG:Body Token Recognized But Could Not Connect: 4TOES_RQ
DOG:Body Token Recognized But Could Not Connect: MOUTH
DOG:Body Token Recognized But Could Not Connect: GENERIC_TEETH_WITH_LARGE_EYE_TEETH
DOG:Body Token Recognized But Could Not Connect: RIBCAGE
DOG:Tissue layer not added because no BP found: BY_CATEGORY:TOE:NAIL
DOG:Attack BITE seems to have correct format but could not find proper BPs in any caste, so not added
DOG:Attack SCRATCH seems to have correct format but could not find proper BPs in any caste, so not added
DOG Color Mod Ending With (ECRU,1) Was Not Used
DOG Color Mod Ending With (ECRU,1) Was Not Used
DOG Color Mod Ending With (ECRU,1) Was Not Used
DOG Color Mod Ending With (ECRU,1) Was Not Used
DOG Color Mod Ending With (ECRU,1) Was Not Used
DOG Color Mod Ending With (ECRU,1) Was Not Used
DOG Color Mod Ending With (TAUPE_SANDY,1) Was Not Used
DOG Color Mod Ending With (IRIS_EYE_TURQUOISE,1) Was Not Used
Subsequently removing dogs from my starting profile allows me to embark, but as soon as one shows up from immigrants or caravans, it crashes again.