docs(P20): specify phase 20 — consumer happy path + reusable deploy workflow (v1.5)

---ci---
project: acdl
phase: 20
milestone: v1.5
status: specify
---/ci---

Add v1.5 milestone to ROADMAP.md + REQUIREMENTS.md. Phase 20 covers
REQ-46 (README consumer model + mermaid + L3B/spike scrub), REQ-47
(generic CONSUMER_GUIDE.md + versioned uses: + consumer-scoped prereqs
+ run-time platform fetch), REQ-48 (zero-trust OIDC/ABAC credentials +
static-key override + daily rotation), REQ-49 (reusable byte-identical
deploy.yml Gitea+GitHub implementing pipelines/deploy.yaml), REQ-50
(contracts/static-asset.yaml @v1.4), REQ-51 (deploy-workflow conformance
tests). Update config.json milestone to v1.5.

modules/l1/s3/interface.json

@@ -0,0 +1,36 @@
+{
+  "name": "l1-s3",
+  "version": "1.0.0",
+  "kind": "l1",
+  "type": "aws:s3:bucket",
+  "description": "S3 bucket primitive (substrate-agnostic IR type aws:s3:bucket; the Terraform adapter translates to aws_s3_bucket).",
+  "inputs": {
+    "bucket_name": {
+      "type": "string",
+      "description": "Globally-unique S3 bucket name.",
+      "required": true
+    },
+    "region": {
+      "type": "string",
+      "description": "AWS region the bucket is created in.",
+      "required": true
+    }
+  },
+  "outputs": {
+    "bucket_arn": {
+      "type": "arn",
+      "description": "The S3 bucket ARN."
+    },
+    "bucket_name": {
+      "type": "string",
+      "description": "The bucket name (echoes the input)."
+    }
+  },
+  "nfrs": {
+    "versioning": {
+      "type": "boolean",
+      "description": "Enable S3 versioning (default true).",
+      "default": true
+    }
+  }
+}