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/implementing-cloud-trail-log-analysis/references/api-reference.md

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+# API Reference: Implementing CloudTrail Log Analysis
+
+## Libraries
+
+### boto3 -- AWS CloudTrail
+- **Install**: `pip install boto3`
+- **Docs**: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/cloudtrail.html
+
+### Key Methods
+
+| Method | Description |
+|--------|-------------|
+| `lookup_events()` | Search recent CloudTrail events with filters |
+| `describe_trails()` | List configured trails |
+| `get_trail_status()` | Check if trail is actively logging |
+| `create_trail()` | Create a new CloudTrail trail |
+| `start_logging()` / `stop_logging()` | Control trail recording |
+| `get_event_selectors()` | View event type configuration |
+| `put_event_selectors()` | Configure management/data event capture |
+
+## Lookup Attributes
+
+| AttributeKey | Description |
+|-------------|-------------|
+| `EventName` | API action name (e.g., `RunInstances`) |
+| `Username` | IAM user or role name |
+| `ResourceType` | AWS resource type |
+| `ResourceName` | Specific resource identifier |
+| `EventSource` | AWS service (e.g., `ec2.amazonaws.com`) |
+| `ReadOnly` | Filter read vs write events |
+
+## Suspicious Event Names
+
+| Event | Threat Category |
+|-------|----------------|
+| `StopLogging` / `DeleteTrail` | Anti-forensics |
+| `CreateUser` / `CreateAccessKey` | Persistence |
+| `AttachUserPolicy` / `PutUserPolicy` | Privilege escalation |
+| `ConsoleLogin` (failed) | Brute force |
+| `RunInstances` | Resource abuse / cryptomining |
+| `AuthorizeSecurityGroupIngress` | Lateral movement |
+| `DisableKey` | Ransomware indicator |
+
+## Athena Query Integration
+- Create Athena table from CloudTrail S3 logs
+- SQL queries for historical analysis beyond 90-day API limit
+- Partition by region, year, month for performance
+
+## CloudWatch Logs Insights
+- `filter eventName = "ConsoleLogin"` -- Login analysis
+- `stats count(*) by eventName` -- API call frequency
+- `filter errorCode = "AccessDenied"` -- Permission issues
+
+## External References
+- CloudTrail User Guide: https://docs.aws.amazon.com/awscloudtrail/latest/userguide/
+- CloudTrail Log Events: https://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-event-reference.html
+- Athena + CloudTrail: https://docs.aws.amazon.com/athena/latest/ug/cloudtrail-logs.html