issue-0038: xfail repro — recv capture inside #objc_call

Uncomments the second passthrough case in `examples/issue-0038.sx`
that captures `recv` from the enclosing function into a closure body
that uses it inside `#objc_call(s64)(recv, "hash")`. Current behavior
is a hard error from the name-resolution pass:

    examples/issue-0038.sx:28:48: error: unresolved: 'recv'

Snapshot locks the failure in (exit 1 + that error message) so the
next commit can flip it to passing without ambiguity. Per the FFI
cadence rule this is a test-add (xfail); the make-green follow-up
adds the missing recursion arm in `lower.zig`'s `collectCaptures` for
`.ffi_intrinsic_call` nodes.

examples/issue-0038.sx

@@ -17,22 +17,28 @@
 
 #import "modules/std.sx";
 #import "modules/compiler.sx";
+#import "modules/std/objc.sx";
 
 passthrough_works :: (recv: *void) -> Closure(s32) -> *void {
     closure((d: s32) -> *void => recv);  // captures `recv` — fine
 }
 
-// passthrough_via_objc_call :: (recv: *void) -> Closure(s32) -> s64 {
-//     // Same `recv` capture, but inside `#objc_call(...)`:
-//     //   error: unresolved: 'recv'
-//     closure((d: s32) -> s64 => #objc_call(s64)(recv, "hash"));
-// }
+passthrough_via_objc_call :: (recv: *void) -> Closure(s32) -> s64 {
+    // Same `recv` capture, but inside `#objc_call(...)`.
+    closure((d: s32) -> s64 => #objc_call(s64)(recv, "hash"));
+}
 
 main :: () -> s32 {
     inline if OS == .macos {
         f := passthrough_works(null);
         p := f(0);
         print("ok (passthrough works) = {}\n", p == null);
+
+        // After the fix, capture in an FfiIntrinsicCall arg list works.
+        ns_object := objc_getClass("NSObject".ptr);
+        g := passthrough_via_objc_call(ns_object);
+        h := g(0);
+        print("ok (passthrough via #objc_call) = {}\n", h != 0);
     }
     inline if OS != .macos {
         print("skipped (not macos)\n");

tests/expected/issue-0038.exit

@@ -1 +1 @@
-0
+1

tests/expected/issue-0038.txt

@@ -1 +1 @@
-ok (passthrough works) = true
+/Users/agra/projects/sx/examples/issue-0038.sx:28:48: error: unresolved: 'recv'