cfe9d70e47
S1: sem_open refcounting ✅ S2: name canonicalization (sem.* prefix) + va_list parsing ✅ S3: EINTR handling (Semaphore::wait c_int errno, retry loop) ✅ S4: kernel eventfd (event.rs eventfd field + scheme/event.rs path parsing) ✅ Kernel P0-eventfd-kernel.patch wired into recipe, compiles, boots. Greeter ready on VT 3 verified. Docs: RELIBC-AGAINST-GLIBC-ASSESSMENT.md (glibc 2.41 cross-reference) ✅ All 4 phases implemented, shipped, boot verified.