feat(P27): validated per-module examples (D-058) + schema glob fix

Add modules/<name>/examples/ directories with simple.yaml + complex.yaml
(+ mysql.yaml for RDS) for every primitive and module pattern. All 25
example contracts validate against schemas/contract.schema.json. Update
the contract schema to allow object/array input values (for env vars).
Fix the platform-test schema-validation glob to modules/*/*/examples/*.yaml
to match the nested l1/l2 path structure. Update the microservice sample
contract note (env objects now permitted by the schema).

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

modules/l1/cloudfront/examples/complex.yaml

@@ -0,0 +1,12 @@
+# 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

modules/l1/cloudfront/examples/simple.yaml

@@ -0,0 +1,7 @@
+# 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