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-file-carving-with-foremost/references/api-reference.md

@@ -0,0 +1,48 @@
+# API Reference: File Carving with Foremost
+
+## Foremost CLI
+
+| Command | Description |
+|---------|-------------|
+| `foremost -t <types> -i <image> -o <output>` | Carve files of specified types from image |
+| `foremost -c <config> -i <image> -o <output>` | Carve using custom configuration file |
+| `foremost -v -t all -i <image> -o <output>` | Verbose carving of all supported types |
+
+## Foremost Options
+
+| Flag | Description |
+|------|-------------|
+| `-t` | File types to carve (jpg, png, pdf, doc, all) |
+| `-i` | Input disk image path |
+| `-o` | Output directory for carved files |
+| `-c` | Custom foremost.conf path |
+| `-v` | Verbose mode with progress details |
+
+## Scalpel CLI
+
+| Command | Description |
+|---------|-------------|
+| `scalpel -c <config> -o <output> <image>` | High-performance carving with config |
+
+## foremost.conf Format
+
+```
+# extension  case_sensitive  max_size  header  footer
+jpg    y    200000    \xff\xd8\xff    \xff\xd9
+pdf    y    5000000   %PDF           %%EOF
+```
+
+## Python Libraries
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| `subprocess` | stdlib | Execute foremost/scalpel commands |
+| `hashlib` | stdlib | SHA-256 hashing for evidence integrity |
+| `pathlib` | stdlib | File system traversal of carved output |
+
+## References
+
+- Foremost source: https://foremost.sourceforge.net/
+- Scalpel repository: https://github.com/sleuthkit/scalpel
+- Sleuth Kit (blkls, mmls): https://sleuthkit.org/
+- File signature database: https://www.garykessler.net/library/file_sigs.html