Drop unused IOC extraction

extract_iocs() (IPs, domains, hashes) ran on every classified article
but the result was never shown in Telegram alerts, never saved to
validation/results.jsonl, and never printed by review.py — pure wasted
work every poll cycle. MITRE technique extraction stays; that one is
actually used by the validation tooling.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

content_classifier.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 """
 Content Classifier for Threat Intelligence RSS Bot
-Extracts CVEs, threat actors, malware families, MITRE techniques, and IOCs.
+Extracts CVEs, threat actors, malware families, and MITRE technique IDs.
 """
 
 import re
@@ -47,11 +47,6 @@ class ContentClassifier:
 
     MITRE_PATTERN    = re.compile(r'T\d{4}(?:\.\d{3})?', re.IGNORECASE)
     CVE_PATTERN      = re.compile(r'CVE-\d{4}-\d{4,7}', re.IGNORECASE)
-    IP_PATTERN       = re.compile(r'\b(?:\d{1,3}\.){3}\d{1,3}\b')
-    DOMAIN_PATTERN   = re.compile(r'\b[a-z0-9]+(?:[\-\.]{1}[a-z0-9]+)*\.[a-z]{2,6}\b', re.IGNORECASE)
-    HASH_MD5_PATTERN = re.compile(r'\b[a-f0-9]{32}\b', re.IGNORECASE)
-    HASH_SHA1_PATTERN   = re.compile(r'\b[a-f0-9]{40}\b', re.IGNORECASE)
-    HASH_SHA256_PATTERN = re.compile(r'\b[a-f0-9]{64}\b', re.IGNORECASE)
 
     def extract_cves(self, text: str) -> List[str]:
         return list(set(cve.upper() for cve in self.CVE_PATTERN.findall(text)))
@@ -75,21 +70,6 @@ class ContentClassifier:
             if re.search(r'\b' + re.escape(family.lower()) + r'\b', text_lower)
         ))
 
-    def extract_iocs(self, text: str) -> Dict[str, List[str]]:
-        iocs: Dict[str, List[str]] = {
-            'ips': [], 'domains': [], 'md5': [], 'sha1': [], 'sha256': []
-        }
-        for ip in self.IP_PATTERN.findall(text):
-            if all(0 <= int(o) <= 255 for o in ip.split('.')):
-                iocs['ips'].append(ip)
-        iocs['md5']     = self.HASH_MD5_PATTERN.findall(text)
-        iocs['sha1']    = self.HASH_SHA1_PATTERN.findall(text)
-        iocs['sha256']  = self.HASH_SHA256_PATTERN.findall(text)
-        iocs['domains'] = [m.group(0).lower() for m in self.DOMAIN_PATTERN.finditer(text)]
-        for key in iocs:
-            iocs[key] = list(set(iocs[key]))[:5]
-        return iocs
-
     def classify_article(self, article: Dict) -> Dict:
         combined_text = f"{article.get('title', '')} {article.get('description', '')}"
 
@@ -97,13 +77,11 @@ class ContentClassifier:
         mitre_techniques = self.extract_mitre_techniques(combined_text)
         threat_actors    = self.extract_threat_actors(combined_text)
         malware_families = self.extract_malware_families(combined_text)
-        iocs             = self.extract_iocs(combined_text)
 
         article['cves']             = cves
         article['mitre_techniques'] = mitre_techniques
         article['threat_actors']    = threat_actors
         article['malware_families'] = malware_families
-        article['iocs']             = iocs
 
         logger.info(
             f"Classified: {article.get('title', '')[:50]}... | "