refactor: obtain arguments through process initialization

std/process/arguments.hon

@@ -1,18 +1,11 @@
-# the bootstrap Init currently exposes only io; macOS provides process-lifetime argv storage.
-@hide:file
-_NSGetArgc c_func() @c_int
-
-@hide:file
-_NSGetArgv c_func() @*[*;0]u8
-
-argument_count proc() usize {
-    return usize(_NSGetArgc()^)
+argument_count proc(args Args) usize {
+    return args.values.len
 }
 
-#! returns a borrowed, zero-terminated slice; storage lasts for the process lifetime.
-argument proc(index usize) ?[;0]u8 {
-    if (index >= argument_count()) return null
-    pointer :: _NSGetArgv()^[index]
+#! returns a borrowed, zero-terminated slice, valid while the supplied argument storage lives.
+argument proc(args Args, index usize) ?[;0]u8 {
+    if (index >= argument_count(args)) return null
+    pointer :: args.values[index]
     length := usize(0)
     while (pointer[length] != 0) length += 1
     return pointer[..length;0]