Add Least Privilege Policy

Least-Privilege-Policy.md

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+Genesis Hosting enforces least privilege access for all systems.
+
+## Principles
+
+- Users are given the minimum level of access necessary to perform their work
+- Admin tools are isolated by function (e.g., billing vs. system access)
+- Escalation of privileges must be requested, documented, and time-bound
+
+## Tools in Use
+
+- WHMCS permissions are restricted by group
+- SSH access is limited using `AllowUsers` and firewalled IPs
+- TeamTalk server admins are rotated and audited monthly
+
+## Review Cycle
+
+- Access roles are reviewed quarterly
+- Logs of access changes are stored and rotated every 90 days