ffi 1.2: parser coverage for #jni_call and #jni_static_call

99/99 regression tests pass (+ffi-jni-call-01-parse).

Locks in the same parse-surface contract for the JNI intrinsics
that ffi-objc-call-01-parse pins for the Obj-C side:

  #jni_call(*void)(null, null, "getWindow", "()Landroid/view/Window;");
  #jni_static_call(s32)(null, null, "max", "(II)I", 3, 7);
  #jni_call(bool)(null, null, "isShown", "()Z");

All three lower through the shared `FfiIntrinsicCall` AST node
added in 1.1; only the kind tag distinguishes them. `inline if false`
keeps sema/codegen out of the picture until later phase-1 steps
wire those in.

examples/ffi-jni-call-01-parse.sx

@@ -0,0 +1,24 @@
+// Phase 1 step 1.2 (PLAN-FFI.md): parser coverage for `#jni_call`
+// and `#jni_static_call`. Same `#<intrinsic>(ReturnT)(args...)`
+// shape as `#objc_call`; lands green on the existing parse rule
+// (Phase 1.1 added all three).
+//
+// `inline if false` suppresses sema/codegen — the lowering arrives
+// in Phase 1.15+; this file pins the parse surface only.
+
+#import "modules/std.sx";
+
+main :: () -> s32 {
+    inline if false {
+        // Instance method: env, target, name, sig, args...
+        #jni_call(*void)(null, null, "getWindow", "()Landroid/view/Window;");
+
+        // Static method: env, class, name, sig, args...
+        #jni_static_call(s32)(null, null, "max", "(II)I", 3, 7);
+
+        // Returning a Java primitive (jboolean → sx bool).
+        #jni_call(bool)(null, null, "isShown", "()Z");
+    }
+    print("parse-only ok\n");
+    0;
+}

tests/expected/ffi-jni-call-01-parse.exit

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

tests/expected/ffi-jni-call-01-parse.txt

@@ -0,0 +1 @@
+parse-only ok