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/building-detection-rule-with-splunk-spl/references/api-reference.md

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+# API Reference: Splunk SPL Detection Rules
+
+## Splunk REST API - Saved Searches
+```
+POST /servicesNS/{owner}/{app}/saved/searches
+Authorization: Bearer TOKEN
+```
+| Field | Description |
+|-------|-------------|
+| `name` | Saved search name |
+| `search` | SPL query string |
+| `is_scheduled` | 1 for scheduled |
+| `cron_schedule` | Cron expression (e.g., `*/5 * * * *`) |
+| `dispatch.earliest_time` | Start of search window |
+| `alert.severity` | 1-5 (info to critical) |
+| `alert_type` | `number of events` |
+| `alert_threshold` | Trigger threshold |
+
+## Key SPL Commands
+| Command | Description |
+|---------|-------------|
+| `stats count by field` | Aggregate events |
+| `where count > N` | Filter results |
+| `table field1, field2` | Select fields |
+| `eval` | Compute new fields |
+| `lookup` | Enrich from lookup table |
+| `tstats` | Accelerated data model search |
+| `join` | Join two datasets |
+
+## Windows Event IDs for Detection
+| EventCode | Source | Description |
+|-----------|--------|-------------|
+| 4624 | Security | Successful logon |
+| 4625 | Security | Failed logon |
+| 4648 | Security | Explicit credential logon |
+| 4698 | Security | Scheduled task created |
+| 4104 | PowerShell | Script block logging |
+| 1 | Sysmon | Process creation |
+| 3 | Sysmon | Network connection |
+| 10 | Sysmon | Process access |
+
+## Alert Severity Levels
+| Level | Value | Description |
+|-------|-------|-------------|
+| Info | 1 | Informational |
+| Low | 2 | Low risk |
+| Medium | 3 | Medium risk |
+| High | 4 | High risk |
+| Critical | 5 | Critical risk |