Add mock-backed integration testing tier and fake Dynu API

scripts/test-integration.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "[test-integration] running mock-backed provider integration tests"
+go test ./internal/provider -run '^TestIntegration' -count=1 -v

scripts/testacc.sh

@@ -1,13 +1,23 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+mode="mock"
+if [[ "${1:-}" == "--live" || "${LIVE:-}" == "1" ]]; then
+  mode="live"
+fi
+
+if [[ "${mode}" == "mock" ]]; then
+  echo "[testacc] no --live flag detected; running local mock-backed integration tests"
+  exec "$(dirname "$0")/test-integration.sh"
+fi
+
 if [[ "${TF_ACC:-}" != "1" ]]; then
-  echo "[testacc][error] TF_ACC must be set to 1" >&2
+  echo "[testacc][error] live mode requires TF_ACC=1" >&2
   exit 1
 fi
 
 if [[ -z "${DYNU_API_KEY:-}" ]]; then
-  echo "[testacc][error] DYNU_API_KEY must be set" >&2
+  echo "[testacc][error] live mode requires DYNU_API_KEY" >&2
   exit 1
 fi
 
@@ -15,5 +25,5 @@ if [[ -z "${DYNU_DOMAIN:-}" ]]; then
   echo "[testacc][warn] DYNU_DOMAIN not set; domain-specific acceptance tests will skip"
 fi
 
-echo "[testacc] running acceptance tests"
+echo "[testacc] running live acceptance tests"
 go test ./internal/provider -run '^TestAcc' -count=1 -v