fix: invalid import and improve tests

refactor: remove initGC

test: add test for GC

fix: invalid import in z_gc

ci: test baremetal GC for coverage

ci: test baremetal GC for coverage

runtime/internal/clite/stdio_baremetal.go

@@ -29,7 +29,12 @@ var Stderr FilePtr = Stdout
 //go:linkname setvbuf C.setvbuf
 func setvbuf(fp FilePtr, buf *Char, typ Int, size SizeT)
 
+const (
+	_IONBF = 2 // No buffering - immediate output
+)
+
 func init() {
-	setvbuf(Stdout, nil, 2, 0)
-	setvbuf(Stdin, nil, 2, 0)
+	// Disable buffering for baremetal targets to ensure immediate output
+	setvbuf(Stdout, nil, _IONBF, 0)
+	setvbuf(Stdin, nil, _IONBF, 0)
 }