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-attack-path-analysis-with-xm-cyber/references/api-reference.md

@@ -0,0 +1,59 @@
+# API Reference: XM Cyber Attack Path Analysis Agent
+
+## Dependencies
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| requests | >=2.28 | HTTP client for XM Cyber REST API |
+
+## CLI Usage
+
+```bash
+python scripts/agent.py \
+  --url https://xmcyber.example.com \
+  --api-key YOUR_API_KEY \
+  --output-dir /reports/ \
+  --output attack_path_report.json
+```
+
+## Functions
+
+### `XMCyberClient(base_url, api_key)`
+Client class with Bearer token auth for the XM Cyber API.
+
+### `get_scenarios() -> list`
+GET `/api/v1/scenarios` - Lists all attack simulation scenarios.
+
+### `get_attack_paths(scenario_id) -> list`
+GET `/api/v1/scenarios/{id}/attack-paths` - Returns attack paths for a scenario.
+
+### `get_choke_points(scenario_id) -> list`
+GET `/api/v1/scenarios/{id}/choke-points` - Returns points where attack paths converge.
+
+### `get_critical_assets() -> list`
+GET `/api/v1/critical-assets` - Lists defined critical business assets.
+
+### `get_entities_at_risk(scenario_id) -> list`
+GET `/api/v1/scenarios/{id}/entities-at-risk` - Entities reachable via attack paths.
+
+### `get_remediation_actions(scenario_id) -> list`
+GET `/api/v1/scenarios/{id}/remediations` - Prioritized fix recommendations.
+
+### `analyze_choke_points(choke_points) -> dict`
+Ranks choke points by paths_through count, returns top 10.
+
+### `compute_risk_score(attack_paths, critical_assets) -> dict`
+Calculates critical asset exposure percentage from reachable targets.
+
+## Output Schema
+
+```json
+{
+  "scenarios": [{
+    "name": "Full Environment",
+    "attack_paths": 1234,
+    "choke_point_analysis": {"total_choke_points": 45, "top_choke_points": []},
+    "risk_score": {"critical_asset_exposure_pct": 67.5}
+  }]
+}
+```