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/extracting-credentials-from-memory-dump/references/api-reference.md

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+# API Reference: Memory Dump Credential Extraction Agent
+
+## Dependencies
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| volatility3 | >=2.0 | Memory forensics framework (invoked via subprocess) |
+| pypykatz | >=0.6 | Python Mimikatz for LSASS credential extraction |
+
+## CLI Usage
+
+```bash
+python scripts/agent.py \
+  --dump /cases/case-001/memory.raw \
+  --output-dir /cases/case-001/analysis/ \
+  --output credential_report.json
+```
+
+## Functions
+
+### `verify_dump(dump_path) -> dict`
+Checks file existence, computes size and SHA-256 of first 1MB for integrity.
+
+### `run_vol3(dump_path, plugin, extra_args) -> str`
+Executes a volatility3 plugin via subprocess with 5-minute timeout. Returns stdout.
+
+### `get_os_info(dump_path) -> dict`
+Runs `windows.info` to identify OS version and build from the memory image.
+
+### `find_lsass_pid(dump_path) -> int`
+Runs `windows.pslist` and locates the LSASS process PID.
+
+### `extract_hashdump(dump_path) -> list`
+Runs `windows.hashdump` to extract SAM database NTLM hashes for local accounts.
+
+### `extract_lsadump(dump_path) -> list`
+Runs `windows.lsadump` to extract LSA secrets (service account passwords).
+
+### `extract_cachedump(dump_path) -> list`
+Runs `windows.cachedump` to extract DCC2 cached domain credential hashes.
+
+### `run_pypykatz(dump_path, output_dir) -> dict`
+Invokes pypykatz in JSON mode against LSASS minidump or full memory image.
+
+### `parse_pypykatz_creds(pypykatz_data) -> list`
+Parses pypykatz JSON output into structured credential list with NTLM, Kerberos, WDigest, DPAPI.
+
+### `search_cloud_keys(dump_path) -> list`
+Uses `windows.strings` to find AWS keys, JWT tokens, and auth strings in memory.
+
+### `generate_report(dump_path, output_dir) -> dict`
+Orchestrates all extraction steps and compiles the final report with summary and actions.
+
+## Volatility3 Plugins Used
+
+| Plugin | Purpose |
+|--------|---------|
+| `windows.info` | OS identification |
+| `windows.pslist` | Process listing (find LSASS PID) |
+| `windows.hashdump` | SAM hash extraction |
+| `windows.lsadump` | LSA secret extraction |
+| `windows.cachedump` | Cached domain credential extraction |
+| `windows.strings` | String search for cloud keys and tokens |
+
+## Output Schema
+
+```json
+{
+  "source": "/cases/memory.raw",
+  "sam_hashes": [{"user": "Administrator", "rid": 500, "ntlm_hash": "fc52..."}],
+  "lsass_creds": [{"user": "CORP\\admin", "cred_types": [{"type": "NTLM", "hash": "..."}]}],
+  "cloud_keys": [{"type": "AWS Access Key", "value": "AKIA..."}],
+  "summary": {"sam_hashes": 4, "lsass_creds": 3, "cloud_keys": 1},
+  "actions": ["Reset passwords for all local accounts..."]
+}
+```