ci: retrigger apply for pending Keel enrollment (~58 stacks)

Bulk enrollment commit 8f4b1956 had its CI pipeline #689 killed before
terragrunt apply ran. The enrollment label + V2 lifecycle changes are
in master but never reached the cluster. Appending a one-line marker
to each pending stack's main.tf so Woodpecker's diff-detection picks
them up and applies them serially.

Idempotent — re-applying a stack whose state already matches is a no-op.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

stacks/insta2spotify/main.tf

@@ -276,3 +276,5 @@ module "ingress_api" {
   ingress_path    = ["/api/identify", "/api/auth", "/api/health", "/api/history"]
   max_body_size   = "50m"
 }
+
+# CI retrigger 2026-05-16T13:42:57+00:00 — bulk enrollment apply (pipeline #689 killed)