fix(ci): revert ci-build pool to GP1-M — stay within vCPU quota

GP1-XL (48 vCPU) exceeds account quota. GP1-M (16 vCPU, 64GB) fits
within current limits while providing sufficient build resources.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitlab-ci.yml

@@ -1,5 +1,5 @@
 # GitLab CI/CD — Foxhunt
-# Runs on ci-build pool (GP1-XL, scale-to-zero)
+# Runs on ci-build pool (GP1-M, scale-to-zero)
 # CI builder image: CUDA 12.4 + Rust 1.89 + protoc + sccache (hosted on Scaleway CR)
 # Service images: pushed to internal GitLab registry (Kaniko)
 

infra/live/production/kapsule/terragrunt.hcl

@@ -27,6 +27,6 @@ inputs = {
 
   # CI build pool (ephemeral runner pods, scale-to-zero)
   enable_ci_build_pool = true
-  ci_build_type        = "GP1-XL"
+  ci_build_type        = "GP1-M"
   ci_build_max_size    = 2
 }