* chore(terraform): remove tf-poc rehearsal
* chore(terraform): drop tf-poc from live module and CI
* chore: clean remaining tf-poc reference from `shared_certificate_arn`
* feat(terraform): add safe backend environment adoption
Introduce import-guarded environment roots and retire temporary bootstrap and POC provisioning after ownership transfer.
* ci(deploy): pause dev and staging deployments
Prevent application releases from racing Terraform adoption while retaining production deployment and validation.
* ci(deploy): require manual environment dispatch
* fix: update `required_version` from `>=1.7.0` to `>=1.9.0`
The deploy-boundary check interpolates `var.aws_account_id` and `var.environment`. Terraform only allows other variables inside `validation` from 1.9.0+.
CI already runs against `1.9.8` so `versions.tf` setting version as `>=1.7.0` is a breaking finding
* chore(deps): add `terraform` to renovate dependency coverage
* ci(deploy): drop unprovisioned prod dispatch path
