Complete folder anatomy for all 649 cybersecurity skills + update LICENSE to Mahipal

- Add scripts/agent.py and references/api-reference.md to all remaining skills
- Update all 648 LICENSE files: copyright now reads 'Mahipal'
- Add implementing-security-monitoring-with-datadog (new skill with full anatomy)
- All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md

skills/performing-plc-firmware-security-analysis/references/api-reference.md

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+# API Reference — Performing PLC Firmware Security Analysis
+
+## Libraries Used
+- **subprocess**: Execute binwalk for firmware extraction
+- **hashlib**: MD5/SHA256 firmware hashing
+- **re**: Credential and vulnerability pattern scanning
+- **pathlib**: Recursive file scanning of extracted firmware
+- **math**: Shannon entropy calculation
+
+## CLI Interface
+```
+python agent.py extract --firmware plc_fw.bin [--output /tmp/fw_extract]
+python agent.py metadata --firmware plc_fw.bin
+python agent.py creds --dir /tmp/fw_extract
+python agent.py vulns --dir /tmp/fw_extract
+python agent.py full --firmware plc_fw.bin [--output /tmp/fw_extract]
+```
+
+## Core Functions
+
+### `extract_firmware(firmware_file, output_dir)` — Binwalk extraction
+### `analyze_firmware_metadata(firmware_file)` — Hash and entropy analysis
+High entropy (>7.5) may indicate encryption or compression.
+
+### `scan_for_credentials(extract_dir)` — Hardcoded credential detection
+Patterns: passwords, default creds, private keys, API keys, connection strings.
+
+### `scan_for_vulnerabilities(extract_dir)` — Code vulnerability patterns
+Detects: command injection (system/popen), buffer overflow risk (strcpy/gets),
+insecure protocols (telnet/FTP), debug mode, backdoor indicators.
+
+### `full_analysis(firmware_file, output_dir)` — Complete analysis pipeline
+
+## Vulnerability Patterns
+| Pattern | Risk | Indicator |
+|---------|------|-----------|
+| command_injection | HIGH | system(), popen(), exec() |
+| buffer_overflow_risk | HIGH | strcpy, strcat, sprintf, gets |
+| insecure_protocol | MEDIUM | telnet, ftp, http:// |
+| debug_enabled | MEDIUM | debug=true, DEBUG_MODE |
+| backdoor_indicator | CRITICAL | backdoor, rootkit, reverse shell |
+
+## Dependencies
+```
+pip install binwalk
+```