Add treasurer update to agenda_2025-12-23.md

Author: falxie

general/agendas/2025/agenda_2025-12-23.md

@@ -37,6 +37,16 @@
   - Come help us make a silly robo-cow-man Zoltaur machine!
 
 # Treasurer Update
+- Last month
+    - Spent last month: $2,926
+    - Received last month: $4,464
+        - +$1,538
+    - Money in the bank: $24,131.60 (Nov 25, 2025)
+- In this last month we have
+    - Spent this month: $2,973
+    - Received this month: $1,600 
+        - -$1,373
+    - Money in the bank: $25,408.79
 
 # Motions and Voting
 - No active motions.