test: add python validator heading detection

scripts/validate_skills.py

@@ -3,6 +3,15 @@ import re
 import argparse
 import sys
 
+WHEN_TO_USE_PATTERNS = [
+    re.compile(r"^##\s+When\s+to\s+Use", re.MULTILINE | re.IGNORECASE),
+    re.compile(r"^##\s+Use\s+this\s+skill\s+when", re.MULTILINE | re.IGNORECASE),
+    re.compile(r"^##\s+When\s+to\s+Use\s+This\s+Skill", re.MULTILINE | re.IGNORECASE),
+]
+
+def has_when_to_use_section(content):
+    return any(pattern.search(content) for pattern in WHEN_TO_USE_PATTERNS)
+
 def parse_frontmatter(content):
     """
     Simple frontmatter parser using regex to avoid external dependencies.
@@ -30,7 +39,6 @@ def validate_skills(skills_dir, strict_mode=False):
     
     # Pre-compiled regex
     security_disclaimer_pattern = re.compile(r"AUTHORIZED USE ONLY", re.IGNORECASE)
-    trigger_section_pattern = re.compile(r"^##\s+When to Use", re.MULTILINE | re.IGNORECASE)
 
     valid_risk_levels = ["none", "safe", "critical", "offensive"]
 
@@ -80,7 +88,7 @@ def validate_skills(skills_dir, strict_mode=False):
                 else: warnings.append(msg)
 
             # 3. Content Checks (Triggers)
-            if not trigger_section_pattern.search(content):
+            if not has_when_to_use_section(content):
                 msg = f"⚠️  {rel_path}: Missing '## When to Use' section"
                 if strict_mode: errors.append(msg.replace("⚠️", "❌"))
                 else: warnings.append(msg)