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/performing-mobile-device-forensics-with-cellebrite/references/api-reference.md

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+# API Reference: Mobile Device Forensics with Cellebrite
+
+## Key SQLite Databases
+
+### Android
+| Database | Path | Content |
+|----------|------|---------|
+| mmssms.db | `data/data/com.android.providers.telephony/databases/` | SMS/MMS messages |
+| calllog.db | `data/data/com.android.providers.contacts/databases/` | Call logs |
+| contacts2.db | `data/data/com.android.providers.contacts/databases/` | Contacts |
+| msgstore.db | `data/data/com.whatsapp/databases/` | WhatsApp messages |
+| History | `data/data/com.android.chrome/app_chrome/Default/` | Chrome history |
+
+### iOS
+| Database | Path | Content |
+|----------|------|---------|
+| sms.db | `HomeDomain/Library/SMS/` | iMessage and SMS |
+| AddressBook.sqlitedb | `HomeDomain/Library/AddressBook/` | Contacts |
+| Safari/History.db | `HomeDomain/Library/Safari/` | Safari browsing history |
+| knowledgeC.db | `RootDomain/private/var/db/CoreDuet/Knowledge/` | App usage patterns |
+
+## ADB Commands (Android)
+
+| Command | Description |
+|---------|-------------|
+| `adb devices` | List connected devices |
+| `adb backup -apk -shared -all -f backup.ab` | Full device backup |
+| `adb pull /data/data/<pkg>/` | Extract app data (root required) |
+| `adb shell pm list packages` | List installed packages |
+
+## libimobiledevice (iOS)
+
+| Command | Description |
+|---------|-------------|
+| `idevice_id -l` | List connected iOS devices |
+| `ideviceinfo -u <UDID>` | Get device information |
+| `idevicebackup2 backup --full <dir>` | Create full iOS backup |
+
+## Python Libraries
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| `sqlite3` | stdlib | Parse mobile app SQLite databases |
+| `csv` | stdlib | Export extracted data |
+| `pathlib` | stdlib | Navigate extraction directory structure |
+
+## References
+
+- ALEAPP: https://github.com/abrignoni/ALEAPP
+- iLEAPP: https://github.com/abrignoni/iLEAPP
+- libimobiledevice: https://libimobiledevice.org/
+- Cellebrite UFED: https://cellebrite.com/en/ufed/