bigmerge
b2aac4bf89
el_runtime.h declared only __thread_create/__thread_join; the mutex and channel seed primitives (__mutex_*, __channel_*) were defined in el_runtime.c but never prototyped. Under Apple clang 21 (C11) the missing prototypes became implicit-declaration errors, and the void-returning __channel_send/__channel_close mis-typed el_val_t (long long) returns, so any El program using runtime/channel.el failed to compile. - add prototypes for __mutex_new/lock/unlock and all __channel_* to el_runtime.h - make __channel_send/__channel_close return el_val_t nil so elc's trailing-expression codegen for the void El wrappers type-checks Additive; unbreaks native channels for every downstream El program.