Memory Safe Context Switching (longjmp, setjmp) in Fil-C

Fil-C implements memory-safe versions of context-switching APIs like setjmp/longjmp and ucontext functions that normally risk stack corruption and dangling pointer vulnerabilities. Traditional implementations allow misuse that can lead to crashes or exploitable security flaws when contexts restore deleted stack frames or execute on freed memory. Fil-C prevents these dangers by either panicking at the point of misuse or ensuring reliable legal execution through its stack management system.