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/exploiting-bgp-hijacking-vulnerabilities/references/api-reference.md

@@ -0,0 +1,59 @@
+# API Reference: BGP Hijacking Assessment Agent
+
+## Dependencies
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| requests | >=2.28 | HTTP client for RIPEstat API queries |
+
+## CLI Usage
+
+```bash
+# Full ASN assessment
+python scripts/agent.py --asn 12345 --output bgp_report.json
+
+# Check a specific prefix
+python scripts/agent.py --asn 12345 --prefix 203.0.113.0/24
+```
+
+## Functions
+
+### `check_rpki_status(prefix, asn) -> dict`
+Queries RIPEstat RPKI validation endpoint. Returns `{status, validating_roas}`.
+
+### `get_announced_prefixes(asn) -> list`
+Lists all prefixes currently announced by the given ASN.
+
+### `get_routing_status(prefix) -> dict`
+Returns first/last seen timestamps, visibility across RIS peers, and origin ASN list.
+
+### `check_roas(prefix) -> list`
+Retrieves Route Origin Authorization records for the prefix.
+
+### `get_bgp_looking_glass(prefix) -> dict`
+Queries RIPEstat looking glass for current route advertisements across RRCs.
+
+### `assess_hijack_resilience(asn) -> dict`
+Runs full assessment: enumerates prefixes, checks RPKI, detects multi-origin conflicts.
+
+## RIPEstat API Endpoints
+
+| Endpoint | Purpose |
+|----------|---------|
+| `/rpki-validation/data.json` | RPKI validity for prefix-origin pair |
+| `/announced-prefixes/data.json` | Prefixes announced by an ASN |
+| `/routing-status/data.json` | Current routing state of a prefix |
+| `/looking-glass/data.json` | BGP routes from RIS collectors |
+
+## Output Schema
+
+```json
+{
+  "asn": 12345,
+  "total_prefixes": 5,
+  "rpki_valid": 3,
+  "rpki_unprotected": 2,
+  "multi_origin_conflicts": 0,
+  "prefix_details": [{"prefix": "203.0.113.0/24", "rpki_status": "valid"}]
+}
+```