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/rds/examples/complex.yaml

@@ -0,0 +1,14 @@
+# Complex RDS postgres with multi-AZ + encryption
+uses: acdl/pipelines/deploy.yaml@v1.6
+module: rds
+environment: dev
+inputs:
+  engine: postgres
+  engine_version: "16.4"
+  instance_class: db.r6g.large
+  allocated_storage: 100
+  db_name: my_production_db
+  username: db_admin
+  multi_az: true
+  storage_encrypted: true
+  region: us-east-1

modules/l1/rds/examples/mysql.yaml

@@ -0,0 +1,12 @@
+# RDS mysql variation
+uses: acdl/pipelines/deploy.yaml@v1.6
+module: rds
+environment: dev
+inputs:
+  engine: mysql
+  engine_version: "8.4"
+  instance_class: db.t3.micro
+  allocated_storage: 20
+  db_name: my_mysql_db
+  username: db_admin
+  region: us-east-1

modules/l1/rds/examples/simple.yaml

@@ -0,0 +1,12 @@
+# Simple RDS postgres instance
+uses: acdl/pipelines/deploy.yaml@v1.6
+module: rds
+environment: dev
+inputs:
+  engine: postgres
+  engine_version: "16.4"
+  instance_class: db.t3.micro
+  allocated_storage: 20
+  db_name: my_app_db
+  username: db_admin
+  region: us-east-1