verify(P19): onboarding-envfile-autogen — 4-layer verify PASS + ship

VERIFY: structural — onboarding.py + rebranded message; behavioral — 18 tests + CI PASS; quality — self-service request path (no human handoff).

---ci---
project: acdl
phase: 19
milestone: v1.16
status: complete
phase_role: execution
requirements:
  covered: [REQ-183]
  partial: []
---/ci---

core/environment_check.py

@@ -55,6 +55,8 @@ def load(env_name, root=None):
 
 
 def _onboarding_message(env_name):
+    # P19 (REQ-183): rebranded Nova self-service request path — no longer
+    # routes to "contact the platform team" for the request step.
     return (
         "=== Nova Environment Onboarding ===\n"
         f"No environment named '{env_name}' is bound to this repository.\n\n"
@@ -66,13 +68,15 @@ def _onboarding_message(env_name):
         "  - an IAM role surfaced to your repo via attribute-based\n"
         "    authorization (ABAC)\n\n"
         "You do not provide an AWS account, VPC, subnet, or state bucket.\n\n"
-        "To request an environment:\n"
-        "  1. Contact the platform team with your repo name + the\n"
+        "To request an environment (self-service):\n"
+        "  1. Submit an onboarding request to the Nova Lambda\n"
+        "     (action: onboard_consumer) with your repo name + the\n"
         "     environment name you need (e.g. 'dev').\n"
-        "  2. The platform team provisions the account/network/state/role\n"
-        "     and binds the environment to your repo.\n"
-        "  3. Your next pipeline run will proceed normally.\n\n"
-        "Expected turnaround: contact the platform team for current SLA.\n"
+        "  2. The platform generates an environment binding + opens a PR.\n"
+        "  3. The platform provisions the account/network/state/role and\n"
+        "     grants the ABAC role. Your next pipeline run proceeds.\n\n"
+        "Run: python3 core/onboarding.py --request '{...}' to generate a\n"
+        "binding file locally, or POST to the Lambda onboard_consumer action.\n"
         "===================================\n"
     )