Fil‑C delivers memory‑safe ucontext APIs, eliminating dangling‑stack crashes
Fil‑C implements setjmp/longjmp and the POSIX ucontext family (getcontext, setcontext, makecontext, swapcontext) without unsafe code, guaranteeing stack safety. Misusing these APIs can no longer corrupt memory; violations trigger panics at the call site. This lets Rust‑based OS and embedded projects use classic coroutine primitives safely.