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/remediating-s3-bucket-misconfiguration/references/api-reference.md

@@ -0,0 +1,81 @@
+# API Reference: S3 Bucket Misconfiguration Remediation Agent
+
+## Overview
+
+Audits and remediates S3 bucket security: public access blocks, bucket policies, ACLs, encryption, versioning, and access logging using boto3.
+
+## Dependencies
+
+| Package | Version | Purpose |
+|---------|---------|---------|
+| boto3 | >= 1.28 | AWS S3 API for audit and remediation |
+
+## Audit Functions
+
+### `check_public_access_block(s3, bucket)`
+Verifies all four S3 Block Public Access settings are enabled.
+- **Returns**: `dict` with `block_config`, `fully_blocked`
+
+### `check_bucket_policy(s3, bucket)`
+Parses bucket policy for `Principal: "*"` Allow statements.
+- **Returns**: `dict` with `public_statements` list (risk: CRITICAL)
+
+### `check_bucket_acl(s3, bucket)`
+Checks ACL grants for AllUsers or AuthenticatedUsers URIs.
+- **Returns**: `dict` with `public_grants` list
+
+### `check_encryption(s3, bucket)`
+Checks for default server-side encryption configuration.
+- **Returns**: `dict` with `encrypted`, `algorithm` (AES256 or aws:kms)
+
+### `check_versioning(s3, bucket)`
+Checks versioning status and MFA Delete configuration.
+- **Returns**: `dict` with `status`, `mfa_delete`
+
+### `check_logging(s3, bucket)`
+Verifies access logging is enabled with target bucket.
+- **Returns**: `dict` with `logging_enabled`, `target_bucket`
+
+### `audit_all_buckets(s3)`
+Full audit across all buckets, sorted by issue count.
+- **Returns**: `list[dict]` with risk rating per bucket
+
+## Remediation Functions
+
+### `enable_public_access_block(s3, bucket)`
+Enables all four S3 Block Public Access settings.
+
+### `enable_encryption(s3, bucket, algorithm)`
+Configures default SSE-KMS or AES256 encryption with bucket key.
+
+### `enable_versioning(s3, bucket)`
+Enables S3 versioning on the bucket.
+
+## AWS API Calls
+
+| API Call | Purpose |
+|----------|---------|
+| `list_buckets` | Enumerate all buckets |
+| `get_public_access_block` | Check block config |
+| `put_public_access_block` | Apply block config |
+| `get_bucket_policy` | Read bucket policy |
+| `get_bucket_acl` | Read ACL grants |
+| `get_bucket_encryption` | Check encryption |
+| `put_bucket_encryption` | Enable encryption |
+| `get_bucket_versioning` | Check versioning |
+| `put_bucket_versioning` | Enable versioning |
+| `get_bucket_logging` | Check access logging |
+
+## Environment Variables
+
+| Variable | Required | Description |
+|----------|----------|-------------|
+| `AWS_ACCESS_KEY_ID` | Yes | AWS credential |
+| `AWS_SECRET_ACCESS_KEY` | Yes | AWS credential |
+| `AWS_DEFAULT_REGION` | No | Default: us-east-1 |
+
+## Usage
+
+```bash
+python agent.py us-east-1
+```