Add folder anatomy (scripts/agent.py + references/api-reference.md) for 648 cybersecurity skills

Complete skill folder anatomy across all cybersecurity skills:
- scripts/agent.py: 80-150 line Python agents using real libraries (impacket,
  boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.)
- references/api-reference.md: real API documentation with method signatures
- LICENSE: MIT license for all skill folders

skills/implementing-threat-intelligence-platform/references/api-reference.md

@@ -0,0 +1,56 @@
+# API Reference: MISP Threat Intelligence Platform
+
+## PyMISP Constructor
+```python
+from pymisp import PyMISP, MISPEvent, MISPAttribute, MISPTag
+misp = PyMISP(url, key, ssl=True, debug=False, proxies=None,
+              cert=None, auth=None, tool='', timeout=None)
+```
+
+## Core Methods
+```python
+misp.add_event(event, pythonify=False, metadata=False)
+misp.get_event(event_id, pythonify=False)
+misp.update_event(event, pythonify=False)
+misp.add_attribute(event_id, attribute, pythonify=False)
+misp.update_attribute(attribute, pythonify=False)
+misp.search(value=None, type_attribute=None, category=None,
+            org=None, tags=None, pythonify=False)
+misp.add_tag(tag, pythonify=False)
+misp.get_stix_event(event_id)
+```
+
+## MISPEvent Object
+```python
+event = MISPEvent()
+event.info = "Event description"
+event.threat_level_id = 2  # 1=High, 2=Medium, 3=Low, 4=Undefined
+event.distribution = 1     # 0=Org, 1=Community, 2=Connected, 3=All
+event.analysis = 0          # 0=Initial, 1=Ongoing, 2=Complete
+event.add_attribute("ip-dst", "1.2.3.4", to_ids=True)
+event.add_tag(tag)
+```
+
+## MISPAttribute Object
+```python
+attr = MISPAttribute()
+attr.type = "ip-dst"  # ip-dst, domain, url, sha256, md5, email-src
+attr.value = "1.2.3.4"
+attr.to_ids = True
+attr.category = "Network activity"
+attr.comment = "C2 server"
+```
+
+## Feed APIs
+| Feed | Endpoint | Method |
+|------|----------|--------|
+| URLhaus | `https://urlhaus-api.abuse.ch/api/v1/urls/recent/limit/N/` | POST |
+| Feodo Tracker | `https://feodotracker.abuse.ch/downloads/ipblocklist_recommended.json` | GET |
+| MalwareBazaar | `https://mb-api.abuse.ch/api/v1/` | POST (query=get_info) |
+
+## VirusTotal v3 - IP Enrichment
+```
+GET /api/v3/ip_addresses/{ip}
+Header: x-apikey: <key>
+Response: data.attributes.last_analysis_stats.malicious
+```