diff --git a/src/frameforge/core.py b/src/frameforge/core.py
index 1dda06c..a334652 100644
--- a/src/frameforge/core.py
+++ b/src/frameforge/core.py
@@ -6,7 +6,7 @@
 from pathlib import Path
 from urllib.parse import urlsplit
 from importlib.resources import files
-from .semantic import evaluate, validate_rules
+from .semantic import evaluate, mask_comments, validate_rules
 from .plugin_checks import run as run_plugin_checks, validate_profile_checks
 from .remediation import advise as advise_warnings
 from .custom_standards import summarize as summarize_custom_standards
@@ -125,9 +125,11 @@ def professional_preview(root, manifest):
                 content = safe.read_text(encoding='utf-8')
             except (OSError, UnicodeError):
                 continue
-            pattern = (r'//[^\n]*|/\*[\s\S]*?\*/' if path.suffix in ('.cs','.asmdef')
-                       else r'--\[\[[\s\S]*?\]\]|--[^\n]*')
-            content = re.sub(pattern, lambda m: re.sub(r'[^\n]', ' ', m.group()), content)
+            if path.suffix == '.cs':
+                content = mask_comments(content, 'csharp')
+            elif path.suffix == '.lua':
+                content = mask_comments(content, 'lua')
+            # .asmdef is JSON: do not apply C# comment rules to JSON string values.
             evidence.append((rel, content))
             if len(evidence) >= 150:
                 break
diff --git a/src/frameforge/semantic.py b/src/frameforge/semantic.py
index e6153cd..f7561c4 100644
--- a/src/frameforge/semantic.py
+++ b/src/frameforge/semantic.py
@@ -3,6 +3,28 @@
 from pathlib import Path
 
 
+def mask_comments(source, language):
+    """Mask real C# or Lua comments while preserving quoted string contents and line numbers."""
+    if language == "csharp":
+        pattern = re.compile(
+            r'(?P<string>(?P<raw_delimiter>"{3,})[\s\S]*?(?P=raw_delimiter)|@"(?:""|[^"])*"|"(?:\\.|[^"\\])*"|\'(?:\\.|[^\'\\])*\')'
+            r'|(?P<comment>//[^\n]*|/\*[\s\S]*?\*/)'
+        )
+    elif language == "lua":
+        pattern = re.compile(
+            r'(?P<long_string>\[(?P<eq>=*)\[[\s\S]*?\](?P=eq)\])'
+            r'|(?P<string>"(?:\\.|[^"\\])*"|\'(?:\\.|[^\'\\])*\')'
+            r'|(?P<comment>--\[(?P<comment_eq>=*)\[[\s\S]*?\](?P=comment_eq)\]|--[^\n]*)'
+        )
+    else:
+        raise ValueError("unsupported comment masking language")
+    return pattern.sub(
+        lambda match: re.sub(r'[^\n]', ' ', match.group())
+        if match.group("comment") else match.group(),
+        source,
+    )
+
+
 def evaluate(root, rule):
     """Observe declared literals across bounded source paths; never claim control-flow compliance."""
     root = Path(root).resolve()
@@ -16,23 +38,7 @@ def evaluate(root, rule):
         except (UnicodeError, OSError):
             continue
         # Comment filtering is intentionally conservative; not a language parser.
-        language = rule["language"]
-        if language == "csharp":
-            pattern = re.compile(
-                r'(?P<string>(?P<raw_delimiter>"{3,})[\s\S]*?(?P=raw_delimiter)|@"(?:""|[^"])*"|"(?:\\.|[^"\\])*"|\'(?:\\.|[^\'\\])*\')'
-                r'|(?P<comment>//[^\n]*|/\*[\s\S]*?\*/)'
-            )
-        else:
-            pattern = re.compile(
-                r'(?P<long_string>\[(?P<eq>=*)\[[\s\S]*?\](?P=eq)\])'
-                r'|(?P<string>"(?:\\.|[^"\\])*"|\'(?:\\.|[^\'\\])*\')'
-                r'|(?P<comment>--\[(?P<comment_eq>=*)\[[\s\S]*?\](?P=comment_eq)\]|--[^\n]*)'
-            )
-        source = pattern.sub(
-            lambda match: re.sub(r'[^\n]', ' ', match.group())
-            if match.group("comment") else match.group(),
-            source,
-        )
+        source = mask_comments(source, rule["language"])
         sources.append((relative, source))
 
     if not sources:
diff --git a/tests/test_professional_guidance.py b/tests/test_professional_guidance.py
index 0e20677..d09e542 100644
--- a/tests/test_professional_guidance.py
+++ b/tests/test_professional_guidance.py
@@ -48,6 +48,35 @@ def test_unmatched_signal_is_not_a_gap(self):
             r=inspect(root)['professional_guidance']
             self.assertTrue(all(item['status']=='not_evaluated' for item in r))
 
+    def test_csharp_url_string_does_not_hide_professional_guidance_signal(self):
+        with tempfile.TemporaryDirectory() as d:
+            root=Path(d)
+            (root/'ProjectSettings').mkdir()
+            (root/'ProjectSettings/ProjectVersion.txt').write_text('Unity')
+            source=root/'Assets/Controller.cs'
+            source.parent.mkdir()
+            source.write_text('var url = "https://example.com"; MonoBehaviour; // MonoBehaviour\n')
+            (root/'.frameforge').mkdir()
+            (root/'.frameforge/profile.json').write_text(json.dumps(
+                {'schema_version':1,'selected_plugins':[{'id':'unity','version':'1.0.0'}]}))
+            result=inspect(root)['professional_guidance']
+            self.assertEqual(result[0]['status'],'review_recommended')
+            self.assertEqual(result[0]['evidence'][0]['path'],'Assets/Controller.cs')
+
+    def test_lua_comment_marker_in_string_does_not_hide_skynet_guidance_signal(self):
+        with tempfile.TemporaryDirectory() as d:
+            root=Path(d)
+            (root/'Dockerfile').write_text('FROM cloudwu/skynet')
+            source=root/'backend/actor.lua'
+            source.parent.mkdir()
+            source.write_text('local marker = "-- text"; skynet.start(function() end) -- skynet.start(false)\n')
+            (root/'.frameforge').mkdir()
+            (root/'.frameforge/profile.json').write_text(json.dumps(
+                {'schema_version':1,'selected_plugins':[{'id':'skynet','version':'1.0.0'}]}))
+            result=inspect(root)['professional_guidance']
+            self.assertEqual(result[0]['status'],'review_recommended')
+            self.assertEqual(result[0]['evidence'][0]['path'],'backend/actor.lua')
+
     def test_comments_not_treated_as_signals(self):
         with tempfile.TemporaryDirectory() as d:
             root=Path(d)