feat(P4): Nova rebrand — AWS resource migration (REQ-163)

Rename all acdl-* AWS resources → nova-* across terraform (DynamoDB,
Secrets Manager, Lambda, SNS, SG, KMS alias, ECS, ECR, IAM user/policy,
state bucket, ALB, VPC/subnet names). Lambda default table names → nova-*
(D-111). State bucket backend → nova-tfstate (-migrate-state documented).
New docs/NOVA_AWS_MIGRATION.md runbook (staged migration + rollback).
New scripts/migrate_dynamodb_data.py (scan+copy, dry-run default).
acdl-deploy- → nova-deploy- role ARN in deploy workflows. Test fixtures
updated; terraform validate + pytest + run_ci.sh PASS.

---ci---
project: acdl
phase: 4
milestone: v1.15
status: execute
---/ci---

modules/l1/s3/terraform/outputs.tf

@@ -10,5 +10,5 @@ output "bucket_name" {
 
 output "bucket_regional_domain_name" {
   value       = aws_s3_bucket.this.bucket_regional_domain_name
-  description = "The bucket regional domain name (e.g. acdl-spike-bucket.s3.us-east-1.amazonaws.com)."
+  description = "The bucket regional domain name (e.g. nova-spike-bucket.s3.us-east-1.amazonaws.com)."
 }