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/cloudfront/interface.json

@@ -43,6 +43,11 @@
       "type": "string",
       "description": "AWS region (CloudFront is global but the provider region is used for the OAC).",
       "required": true
+    },
+    "enabled": {
+      "type": "boolean",
+      "default": true,
+      "description": "Feature flag: enable/disable this module. Set to false to skip resource creation."
     }
   },
   "outputs": {
@@ -75,17 +80,37 @@
     {
       "type": "aws:cloudfront:distribution",
       "description": "CloudFront distribution with S3 origin via OAC.",
-      "inputs": ["bucket_regional_domain_name", "price_class", "viewer_protocol_policy", "default_ttl", "max_ttl", "waf_web_acl_arn", "oac_id"],
-      "outputs": ["distribution_arn", "distribution_domain_name"]
+      "inputs": [
+        "bucket_regional_domain_name",
+        "price_class",
+        "viewer_protocol_policy",
+        "default_ttl",
+        "max_ttl",
+        "waf_web_acl_arn",
+        "oac_id"
+      ],
+      "outputs": [
+        "distribution_arn",
+        "distribution_domain_name"
+      ]
     },
     {
       "type": "aws:cloudfront:originaccesscontrol",
       "description": "Origin Access Control for the S3 origin.",
-      "inputs": ["name", "origin_type", "signing_behavior"],
-      "outputs": ["oac_id"]
+      "inputs": [
+        "name",
+        "origin_type",
+        "signing_behavior"
+      ],
+      "outputs": [
+        "oac_id"
+      ]
     }
   ],
   "intra_refs": [
-    {"from": "aws:cloudfront:distribution.oac_id", "to": "aws:cloudfront:originaccesscontrol.oac_id"}
+    {
+      "from": "aws:cloudfront:distribution.oac_id",
+      "to": "aws:cloudfront:originaccesscontrol.oac_id"
+    }
   ]
-}
+}