feat(P4): transparent terraform + feature flags + run_platform.sh split (REQ-233..238)

Create run_codegen.sh (pre-TF: env check, validate, resolve, adapt).
Create run_postapply.sh (post-TF: Checkov, confidence, HITL, outbox, SSM, uptime).
Add variable 'enabled' (bool, default true) + count=var.enabled?1:0 to all 12
L1 modules (alb, cloudfront, ecr, ecs-cluster, ecs-service, iam-role, kms-key,
rds, s3, uptime, vpc, waf). Fix all cross-resource references with [0] indexing.
Update interface.json for all modules to declare 'enabled' input.
Fix stale artifact path /tmp/acdl_platform_run_v18 → /tmp/nova_platform_run (REQ-238).
run_platform.sh remains as backward-compat shim for local-dev usage.

---ci---
project: acdl
phase: 4
milestone: v1.20
status: execute
requirements: [REQ-233, REQ-234, REQ-235, REQ-236, REQ-237, REQ-238]
---/ci---

modules/l1/s3/interface.json

@@ -19,6 +19,11 @@
       "type": "string",
       "description": "ARN of the CMK for SSE-KMS; if absent, uses managed key.",
       "required": false
+    },
+    "enabled": {
+      "type": "boolean",
+      "default": true,
+      "description": "Feature flag: enable/disable this module. Set to false to skip resource creation."
     }
   },
   "outputs": {
@@ -57,4 +62,4 @@
       "default": true
     }
   }
-}
+}