fix: robustify EndSetup detection and add warning test

filter/kyofilter

@@ -34,7 +34,7 @@ def process_stream(lines, account_code):
 
     for line in lines:
         stripped = line.rstrip(b'\r\n')
-        if not injected and (stripped == b'%%EndSetup' or stripped.startswith(b'%%Page:')):
+        if not injected and (stripped.rstrip() == b'%%EndSetup' or stripped.startswith(b'%%Page:')):
             yield inject
             injected = True
         yield line

tests/test_kyofilter.py

@@ -79,3 +79,9 @@ class TestProcessStream:
         ps = "%!PS\n%%BeginSetup\n%%EndSetup\nshowpage\n"
         result = self._collect(ps, "00012345")
         assert b"showpage\n" in result
+
+    def test_warns_when_no_injection_point(self, capsys):
+        ps = "%!PS\nshowpage\n"
+        self._collect(ps, "00012345")
+        captured = capsys.readouterr()
+        assert "WARNING" in captured.err