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-credential-dumping-with-edr/references/api-reference.md

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+# API Reference: Detecting Credential Dumping with EDR
+
+## T1003 Sub-Techniques
+
+| Sub-technique | Method | Key Evidence |
+|---------------|--------|--------------|
+| T1003.001 | LSASS Memory | Sysmon Event ID 10, GrantedAccess mask |
+| T1003.002 | SAM Registry | reg.exe save HKLM\SAM, Event ID 4656 |
+| T1003.003 | NTDS.dit | vssadmin shadow copy, ntdsutil ifm |
+| T1003.004 | LSA Secrets | Registry HKLM\SECURITY |
+| T1003.005 | Cached Creds | DCC2 hashes in SECURITY hive |
+| T1003.006 | DCSync | Event ID 4662, replication GUIDs |
+
+## python-evtx Library
+
+```python
+import Evtx.Evtx as evtx
+
+with evtx.Evtx("Sysmon.evtx") as log:
+    for record in log.records():
+        xml = record.xml()
+        # Parse EventID, SourceImage, TargetImage, GrantedAccess
+```
+
+## LSASS Suspicious Access Masks
+
+| GrantedAccess | Meaning |
+|---------------|---------|
+| 0x1010 | PROCESS_VM_READ + QUERY_INFO (Mimikatz) |
+| 0x1038 | VM_READ + QUERY_INFO + VM_WRITE |
+| 0x1FFFFF | PROCESS_ALL_ACCESS |
+
+## DCSync Replication GUIDs
+
+```
+DS-Replication-Get-Changes:             1131f6aa-9c07-11d1-f79f-00c04fc2dcd2
+DS-Replication-Get-Changes-All:         1131f6ad-9c07-11d1-f79f-00c04fc2dcd2
+DS-Replication-Get-Changes-In-Filtered: 89e95b76-444d-4c62-991a-0facbeda640c
+```
+
+## Splunk SPL - LSASS Access Detection
+
+```spl
+index=sysmon EventCode=10 TargetImage="*\\lsass.exe"
+| where NOT match(SourceImage, "(csrss|services|svchost|lsm|MsMpEng)\\.exe$")
+| where GrantedAccess IN ("0x1010", "0x1038", "0x1FFFFF")
+| table _time SourceImage GrantedAccess Computer SourceUser
+```
+
+## KQL - Microsoft Defender for Endpoint
+
+```kql
+DeviceProcessEvents
+| where FileName in ("mimikatz.exe", "procdump.exe", "nanodump.exe")
+   or ProcessCommandLine has_any ("sekurlsa", "lsadump", "MiniDump")
+| project Timestamp, DeviceName, FileName, ProcessCommandLine, AccountName
+```
+
+## CLI Usage
+
+```bash
+python agent.py --sysmon-log Sysmon.evtx
+python agent.py --security-log Security.evtx
+python agent.py --command-log process_audit.log
+```