Both were added in 3.13, are undocumented, and don't make sense in 3.14 due to changes in the stack overflow detection machinery. (On current main they contain dummy values.)

SC exception for removal without deprecation:python/steering-council#288

Linked PRs

• gh-133079: Remove Py_C_RECURSION_LIMIT & PyThreadState.c_recursion_remaining #133080