The monitoring stack apply was create-failing on every push with `configmaps
"alert-digest-script" already exists` + `secrets "alert-digest" already exists`
(modules/monitoring/alert_digest.tf) — both resources exist in-cluster but fell
out of Terraform state, so apply tried to CREATE them and errored. Pre-existing
(failed on pipelines 203 AND 204, NOT caused by the t3 alert-rules change). Add
import {} blocks (TF 1.5+ adoption per AGENTS.md) so apply imports + reconciles
instead of failing. Idempotent once imported; safe to remove after a green apply.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
