migrate to the restructured sx stdlib paths

modules/compiler.sx -> modules/build.sx; stb/stb_truetype/opengl/sdl3 ->
modules/ffi/; modules/process.sx -> modules/std/process.sx. Rebuilt for
macos + ios-sim; 23/23 logic snapshots pass.

audio.sx

@@ -10,8 +10,8 @@
 // other targets never reference these symbols nor need the frameworks.
 
 #import "modules/std.sx";
-#import "modules/std/objc.sx";
-#import "modules/compiler.sx";
+#import "modules/ffi/objc.sx";
+#import "modules/build.sx";
 
 // AudioToolbox — System Sound Services. SystemSoundID is a UInt32; OSStatus a
 // SInt32 (0 == noErr); the clip's file is passed as a CFURLRef (opaque ptr).

board_fx.sx

@@ -12,8 +12,8 @@
 // shrink to nothing) rather than alpha — the soft texture edges carry the fade.
 #import "modules/std.sx";
 #import "modules/math";
-#import "modules/opengl.sx";
-#import "modules/stb.sx";
+#import "modules/ffi/opengl.sx";
+#import "modules/ffi/stb.sx";
 #import "modules/gpu/types.sx";
 #import "modules/gpu/api.sx";
 #import "modules/ui/types.sx";

board_view.sx

@@ -6,8 +6,8 @@
 // the grid is a centered square inside the safe-area inset.
 #import "modules/std.sx";
 #import "modules/math";
-#import "modules/opengl.sx";
-#import "modules/stb.sx";
+#import "modules/ffi/opengl.sx";
+#import "modules/ffi/stb.sx";
 #import "modules/gpu/types.sx";
 #import "modules/gpu/api.sx";
 #import "modules/ui/types.sx";

build.sx

@@ -1,4 +1,4 @@
-#import "modules/compiler.sx";
+#import "modules/build.sx";
 #import "modules/platform/bundle.sx";
 
 configure_build :: () {

main.sx

@@ -1,11 +1,11 @@
 #import "modules/std.sx";
 #import "build.sx";
-#import "modules/compiler.sx";
-#import "modules/opengl.sx";
-#import "modules/sdl3.sx";
+#import "modules/build.sx";
+#import "modules/ffi/opengl.sx";
+#import "modules/ffi/sdl3.sx";
 #import "modules/math";
-#import "modules/stb.sx";
-#import "modules/stb_truetype.sx";
+#import "modules/ffi/stb.sx";
+#import "modules/ffi/stb_truetype.sx";
 #import "modules/gpu/api.sx";
 #import "modules/gpu/types.sx";
 #import "modules/gpu/metal.sx";

tests/test.sx

@@ -5,7 +5,7 @@
 // terminates the process NON-ZERO (exit 1) via process.exit, so a broken
 // assertion fails `tools/run_tests.sh` and the build gate.
 #import "modules/std.sx";
-proc :: #import "modules/process.sx";
+proc :: #import "modules/std/process.sx";
 
 expect :: (cond: bool, msg: string, loc: Source_Location = #caller_location) {
     if !cond {

tools/key_particle.sx

@@ -20,7 +20,7 @@
 // never hits this — its loops run over 64 board cells, not millions of pixels.
 #import "modules/std.sx";
 #import "modules/math";
-#import "modules/stb.sx";
+#import "modules/ffi/stb.sx";
 
 SRC_PATH :: "/Users/agra/Downloads/m3te_particle.png";
 OUT_PATH :: "assets/fx/particle.png";