docs(tasks): add Task #31 - Server-to-Server SSH setup

Aurora identified need for passwordless SSH between all management
servers. Currently blocked by non-standard key naming on Billing.

Task documented for future session when Michael has energy.

Signed-off-by: The Librarian <claude@firefrostgaming.com>

docs/core/tasks.md

@@ -424,3 +424,32 @@ Add custom "Modpack Version" field to Pterodactyl panel for version tracking vis
 - v2.2 (2026-02-16): Whitelist Manager expanded to web dashboard
 - v2.1 (2026-02-16): NC1 cleanup marked complete with lessons
 - v2.0 (2026-02-15): Major restructure and organization
+
+---
+
+### 31. Server-to-Server SSH Key Setup
+**Time:** 1-2 hours  
+**Status:** IDENTIFIED - Ready to build  
+**Priority:** Tier 1 - Security Foundation  
+**Documentation:** `docs/tasks/server-ssh-interconnect/`
+
+Enable passwordless SSH between all management servers (Command Center, Billing, Panel, Ghost).
+
+**Problem:** Aurora couldn't SSH from Command Center to Billing - key named 'chronicler' instead of standard 'id_rsa'.
+
+**Solution:**
+1. Collect public keys from all 4 management servers
+2. Add each server's public key to all other servers' authorized_keys
+3. Test connectivity matrix (4x4 grid)
+4. Document key locations and naming
+
+**Servers to interconnect:**
+- Command Center (63.143.34.217)
+- Billing VPS (38.68.14.188)
+- Panel VPS (45.94.168.138)
+- Ghost VPS (64.50.188.14)
+
+**Benefits:** No more switching in MobaXterm, easier automation, cleaner workflows
+
+**Note:** Billing has non-standard key name 'chronicler' - may need renaming to 'id_rsa'
+