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/detecting-lateral-movement-with-splunk/references/api-reference.md

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+# API Reference: Detecting Lateral Movement with Splunk
+
+## Key Lateral Movement Techniques
+
+| Technique | MITRE ID | Event Source |
+|-----------|----------|-------------|
+| Pass-the-Hash | T1550.002 | Event 4624 Logon_Type=3 NTLM |
+| PSExec | T1569.002 | Sysmon Event 1 (PSEXESVC.exe) |
+| WMI Remote Exec | T1047 | Sysmon Event 1 (wmiprvse.exe) |
+| RDP Pivoting | T1021.001 | Event 4624 Logon_Type=10 |
+| SMB/Admin Share | T1021.002 | Network logs dest_port=445 |
+| WinRM | T1021.006 | Sysmon Event 1 (wsmprovhost.exe) |
+
+## Splunk SPL Syntax
+
+```spl
+# Pass-the-Hash detection
+index=wineventlog EventCode=4624 Logon_Type=3
+| where Authentication_Package="NTLM"
+| stats dc(Computer) as targets by Source_Network_Address
+| where targets > 3
+
+# PSExec detection
+index=sysmon EventCode=1
+| where ParentImage="*\\services.exe" AND Image="*\\PSEXESVC.exe"
+```
+
+## splunklib Python SDK
+
+```python
+import splunklib.client as client
+import splunklib.results as results
+
+service = client.connect(host="splunk", port=8089, token="...")
+job = service.jobs.create("search index=wineventlog EventCode=4624")
+for result in results.JSONResultsReader(job.results(output_mode="json")):
+    print(result)
+```
+
+## Windows Logon Types
+
+| Type | Description |
+|------|-------------|
+| 2 | Interactive (console) |
+| 3 | Network (SMB, PSExec) |
+| 7 | Unlock |
+| 10 | RemoteInteractive (RDP) |
+
+## CLI Usage
+
+```bash
+python agent.py --generate-queries
+python agent.py --generate-queries --techniques pass_the_hash psexec_execution
+python agent.py --parse-results splunk_output.json
+```