docs: say what the emuscv BIOS check does

The note judged the CHECKBIOS handling instead of describing it. It now says what memory.cpp:80 does: the MD5 comparison runs only for YES_VAL, so AUTO accepts any content. A rejected BIOS is filled with 0xFF (line 97), not zeroed.

emulators/emuscv.yml

@@ -33,10 +33,11 @@ notes: |
 
   When CHECKBIOS core option is YES, the core computes MD5 of the loaded
   data and compares against 635a978fd40db9a18ee44eff449fc126. If the
-  hash does not match, the BIOS is rejected (zeroed out,
+  hash does not match, the BIOS is rejected (filled with 0xFF,
   bios_present=false). When CHECKBIOS is AUTO (default) or NO, any file
-  content is accepted. The log message for AUTO says "automatic (yes)"
-  but the code skips the check (code bug: != YES_VAL at line 80).
+  content is accepted. With AUTO the log says "automatic (yes)", and the
+  MD5 comparison runs only when the option equals YES_VAL
+  (src/vm/scv/memory.cpp:80), so AUTO accepts any content.
 
   The font/character data is embedded within the BIOS at offset 0x200
   (memory.h get_font() returns bios + 0x200). No separate font ROM file.

tests/test_prose_style.py

@@ -178,6 +178,27 @@ class NoMarketingVocabulary(unittest.TestCase):
         self.assertEqual(offenders, [], "\n".join(offenders[:40]))
 
 
+class ProfilesStateNoVerdict(unittest.TestCase):
+    """A profile note says what the code does, never what is wrong with
+    another project's work (wiki/testing-guide.md): emuscv called its
+    core's option handling a "code bug"."""
+
+    VERDICTS = [
+        re.compile(r"\bcode bug\b", re.IGNORECASE),
+    ]
+
+    def test_no_profile_note_passes_a_verdict(self):
+        offenders = []
+        for path in sorted((ROOT / "emulators").glob("*.yml")):
+            text = " ".join(path.read_text(encoding="utf-8").split())
+            offenders += [
+                f"{path.name}: {found.group(0)}"
+                for pattern in self.VERDICTS
+                for found in pattern.finditer(text)
+            ]
+        self.assertEqual(offenders, [], "\n".join(offenders))
+
+
 def _name(*parts: str) -> str:
     """A private name, assembled so that this file does not carry it."""
     return "".join(parts)