feat(P27): add Examples section to every module README (D-058)

Each module README (10 primitives + 2 patterns) now has a ## Examples
section before ## Versioning, referencing and excerpting the validated
simple.yaml + complex.yaml (+ mysql.yaml for RDS) example contracts. The
RDS README includes a Multi-engine variation subsection (D-059).

---ci---
project: acdl
phase: 27
milestone: v1.7
status: execute
---/ci---

modules/l1/cloudfront/README.md

@@ -71,6 +71,46 @@ inside a module composition (see `modules/l2/static-assets`).
 - **Field-level encryption** — add field-level encryption for PII fields
   in POST bodies (HIPAA §164.312(a)(2)(iv), GDPR Art.32).
 
+## Examples
+
+Validated example contracts are in [`examples/`](examples/). The platform-test
+pipeline validates them against `schemas/contract.schema.json`.
+
+### Simple
+
+A minimal deployment:
+
+[`examples/simple.yaml`](examples/simple.yaml)
+```yaml
+# Simple CloudFront distribution (S3 origin, no WAF)
+uses: acdl/pipelines/deploy.yaml@v1.6
+module: cloudfront
+environment: dev
+inputs:
+  bucket_regional_domain_name: my-bucket.s3.us-east-1.amazonaws.com
+  region: us-east-1
+```
+
+### Complex
+
+A production deployment with optional inputs:
+
+[`examples/complex.yaml`](examples/complex.yaml)
+```yaml
+# Complex CloudFront with WAF + custom TTL + viewer protocol redirect
+uses: acdl/pipelines/deploy.yaml@v1.6
+module: cloudfront
+environment: dev
+inputs:
+  bucket_regional_domain_name: my-bucket.s3.us-east-1.amazonaws.com
+  price_class: PriceClass_100
+  viewer_protocol_policy: redirect-to-https
+  default_ttl: 3600
+  max_ttl: 86400
+  waf_web_acl_arn: arn:aws:wafv2:us-east-1:000000000000:webacl/my-waf
+  region: us-east-1
+```
+
 ## Versioning
 
 `1.0.0` — interface MAJOR, behavior MINOR, lifecycle PATCH. MAJOR bumps