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-graphql-depth-limit-attack/references/api-reference.md

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+# API Reference — Performing GraphQL Depth Limit Attack
+
+## Libraries Used
+- **requests**: Send GraphQL queries with depth/width/batch payloads
+- **time**: Measure response latency for resource exhaustion detection
+
+## CLI Interface
+```
+python agent.py depth --url <endpoint> [--max-depth 20] [--auth-header "Bearer token"]
+python agent.py circular --url <endpoint> --type-a User --field-a posts --type-b Post --field-b author [--depth 10]
+python agent.py batch --url <endpoint> [--count 50]
+python agent.py width --url <endpoint> [--width 50] [--depth 5]
+```
+
+## Core Functions
+
+### `build_nested_query(field_name, depth, leaf)` — Construct nested query payload
+Generates progressively deeper GraphQL queries for depth limit probing.
+
+### `test_depth_limit(url, max_depth, headers)` — Probe depth enforcement
+Sends queries at increasing depth (1 to max_depth). Classifies severity:
+HIGH (>=15 allowed), MEDIUM (>=8), LOW (<8).
+
+### `test_circular_query(url, type_a, field_a, type_b, field_b, depth)` — Test circular references
+Builds alternating A.field_a -> B.field_b chains to test circular query handling.
+
+### `test_batch_query(url, count, headers)` — Test batch query bypass
+Sends array of N queries to check if batching bypasses per-query depth limits.
+
+### `test_resource_exhaustion(url, width, depth, headers)` — Test wide+deep queries
+Combines field width (aliases) with nesting depth. Flags SLOW_RESPONSE if >5s.
+
+## Severity Classification
+- **HIGH**: No depth limit or limit >= 15 levels
+- **MEDIUM**: Depth limit 8-14 or batch queries accepted
+- **LOW**: Depth limit < 8 with proper enforcement
+
+## Dependencies
+```
+pip install requests
+```