rename sample.F90 → sample_preprocessed.F90 to fix macOS case-collision

Co-Authored-By: FatahChan <FatahChan@users.noreply.github.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_languages.py

@@ -784,7 +784,7 @@ def test_fortran_no_dangling_edges():
 
 
 def test_fortran_capital_F_parses_preprocessed():
-    r = extract_fortran(FIXTURES / "sample.F90")
+    r = extract_fortran(FIXTURES / "sample_preprocessed.F90")
     assert "error" not in r
     labels = [n["label"] for n in r["nodes"]]
     assert "shapes" in labels