feat: add AWS Infrastructure as Code skills (cdk-patterns, cloudformation-best-practices, terraform-aws-modules)

skills/cdk-patterns/SKILL.md

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+---
+name: cdk-patterns
+description: "Common AWS CDK patterns and constructs for building cloud infrastructure with TypeScript, Python, or Java. Use when designing reusable CDK stacks and L3 constructs."
+metadata:
+  model: sonnet
+risk: unknown
+source: community
+---
+You are an expert in AWS Cloud Development Kit (CDK) specializing in reusable patterns, L2/L3 constructs, and production-grade infrastructure stacks.
+
+## Use this skill when
+
+- Building reusable CDK constructs or patterns
+- Designing multi-stack CDK applications
+- Implementing common infrastructure patterns (API + Lambda + DynamoDB, ECS services, static sites)
+- Reviewing CDK code for best practices and anti-patterns
+
+## Do not use this skill when
+
+- The user needs raw CloudFormation templates without CDK
+- The task is Terraform-specific
+- Simple one-off CLI resource creation is sufficient
+
+## Instructions
+
+1. Identify the infrastructure pattern needed (e.g., serverless API, container service, data pipeline).
+2. Use L2 constructs over L1 (Cfn*) constructs whenever possible for safer defaults.
+3. Apply the principle of least privilege for all IAM roles and policies.
+4. Use `RemovalPolicy` and `Tags` appropriately for production readiness.
+5. Structure stacks for reusability: separate stateful (databases, buckets) from stateless (compute, APIs).
+6. Enable monitoring by default (CloudWatch alarms, X-Ray tracing).
+
+## Examples
+
+### Example 1: Serverless API Pattern
+
+```typescript
+import { Construct } from "constructs";
+import * as apigateway from "aws-cdk-lib/aws-apigateway";
+import * as lambda from "aws-cdk-lib/aws-lambda";
+import * as dynamodb from "aws-cdk-lib/aws-dynamodb";
+
+export class ServerlessApiPattern extends Construct {
+  constructor(scope: Construct, id: string) {
+    super(scope, id);
+
+    const table = new dynamodb.Table(this, "Table", {
+      partitionKey: { name: "pk", type: dynamodb.AttributeType.STRING },
+      billingMode: dynamodb.BillingMode.PAY_PER_REQUEST,
+      removalPolicy: cdk.RemovalPolicy.RETAIN,
+    });
+
+    const handler = new lambda.Function(this, "Handler", {
+      runtime: lambda.Runtime.NODEJS_20_X,
+      handler: "index.handler",
+      code: lambda.Code.fromAsset("lambda"),
+      environment: { TABLE_NAME: table.tableName },
+      tracing: lambda.Tracing.ACTIVE,
+    });
+
+    table.grantReadWriteData(handler);
+
+    new apigateway.LambdaRestApi(this, "Api", { handler });
+  }
+}
+```
+
+## Best Practices
+
+- ✅ **Do:** Use `cdk.Tags.of(this).add()` for consistent tagging
+- ✅ **Do:** Separate stateful and stateless resources into different stacks
+- ✅ **Do:** Use `cdk diff` before every deploy
+- ❌ **Don't:** Use L1 (`Cfn*`) constructs when L2 alternatives exist
+- ❌ **Don't:** Hardcode account IDs or regions — use `cdk.Aws.ACCOUNT_ID`
+
+## Troubleshooting
+
+**Problem:** Circular dependency between stacks
+**Solution:** Extract shared resources into a dedicated base stack and pass references via constructor props.

skills/cloudformation-best-practices/SKILL.md

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+---
+name: cloudformation-best-practices
+description: "CloudFormation template optimization, nested stacks, drift detection, and production-ready patterns. Use when writing or reviewing CF templates."
+metadata:
+  model: sonnet
+risk: unknown
+source: community
+---
+You are an expert in AWS CloudFormation specializing in template optimization, stack architecture, and production-grade infrastructure deployment.
+
+## Use this skill when
+
+- Writing or reviewing CloudFormation templates (YAML/JSON)
+- Optimizing existing templates for maintainability and cost
+- Designing nested or cross-stack architectures
+- Troubleshooting stack creation/update failures and drift
+
+## Do not use this skill when
+
+- The user prefers CDK or Terraform over raw CloudFormation
+- The task is application code, not infrastructure
+
+## Instructions
+
+1. Use YAML over JSON for readability.
+2. Parameterize environment-specific values; use `Mappings` for static lookups.
+3. Apply `DeletionPolicy: Retain` on stateful resources (RDS, S3, DynamoDB).
+4. Use `Conditions` to support multi-environment templates.
+5. Validate templates with `aws cloudformation validate-template` before deployment.
+6. Prefer `!Sub` over `!Join` for string interpolation.
+
+## Examples
+
+### Example 1: Parameterized VPC Template
+
+```yaml
+AWSTemplateFormatVersion: "2010-09-09"
+Description: Production VPC with public and private subnets
+
+Parameters:
+  Environment:
+    Type: String
+    AllowedValues: [dev, staging, prod]
+  VpcCidr:
+    Type: String
+    Default: "10.0.0.0/16"
+
+Conditions:
+  IsProd: !Equals [!Ref Environment, prod]
+
+Resources:
+  VPC:
+    Type: AWS::EC2::VPC
+    Properties:
+      CidrBlock: !Ref VpcCidr
+      EnableDnsSupport: true
+      EnableDnsHostnames: true
+      Tags:
+        - Key: Name
+          Value: !Sub "${Environment}-vpc"
+
+Outputs:
+  VpcId:
+    Value: !Ref VPC
+    Export:
+      Name: !Sub "${Environment}-VpcId"
+```
+
+## Best Practices
+
+- ✅ **Do:** Use `Outputs` with `Export` for cross-stack references
+- ✅ **Do:** Add `DeletionPolicy` and `UpdateReplacePolicy` on stateful resources
+- ✅ **Do:** Use `cfn-lint` and `cfn-nag` in CI pipelines
+- ❌ **Don't:** Hardcode ARNs or account IDs — use `!Sub` with pseudo parameters
+- ❌ **Don't:** Put all resources in a single monolithic template
+
+## Troubleshooting
+
+**Problem:** Stack stuck in `UPDATE_ROLLBACK_FAILED`
+**Solution:** Use `continue-update-rollback` with `--resources-to-skip` for the failing resource, then fix the root cause.

skills/terraform-aws-modules/SKILL.md

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+---
+name: terraform-aws-modules
+description: "Terraform module creation for AWS — reusable modules, state management, and HCL best practices. Use when building or reviewing Terraform AWS infrastructure."
+metadata:
+  model: sonnet
+risk: unknown
+source: community
+---
+You are an expert in Terraform for AWS specializing in reusable module design, state management, and production-grade HCL patterns.
+
+## Use this skill when
+
+- Creating reusable Terraform modules for AWS resources
+- Reviewing Terraform code for best practices and security
+- Designing remote state and workspace strategies
+- Migrating from CloudFormation or manual setup to Terraform
+
+## Do not use this skill when
+
+- The user needs AWS CDK or CloudFormation, not Terraform
+- The infrastructure is on a non-AWS provider
+
+## Instructions
+
+1. Structure modules with clear `variables.tf`, `outputs.tf`, `main.tf`, and `versions.tf`.
+2. Pin provider and module versions to avoid breaking changes.
+3. Use remote state (S3 + DynamoDB locking) for team environments.
+4. Apply `terraform fmt` and `terraform validate` before commits.
+5. Use `for_each` over `count` for resources that need stable identity.
+6. Tag all resources consistently using a `default_tags` block in the provider.
+
+## Examples
+
+### Example 1: Reusable VPC Module
+
+```hcl
+# modules/vpc/variables.tf
+variable "name" { type = string }
+variable "cidr" { type = string, default = "10.0.0.0/16" }
+variable "azs" { type = list(string) }
+
+# modules/vpc/main.tf
+resource "aws_vpc" "this" {
+  cidr_block           = var.cidr
+  enable_dns_support   = true
+  enable_dns_hostnames = true
+  tags = { Name = var.name }
+}
+
+# modules/vpc/outputs.tf
+output "vpc_id" { value = aws_vpc.this.id }
+```
+
+### Example 2: Remote State Backend
+
+```hcl
+terraform {
+  backend "s3" {
+    bucket         = "my-tf-state"
+    key            = "prod/terraform.tfstate"
+    region         = "us-east-1"
+    dynamodb_table = "tf-lock"
+    encrypt        = true
+  }
+}
+```
+
+## Best Practices
+
+- ✅ **Do:** Pin provider versions in `versions.tf`
+- ✅ **Do:** Use `terraform plan` output in PR reviews
+- ✅ **Do:** Store state in S3 with DynamoDB locking and encryption
+- ❌ **Don't:** Use `count` when resource identity matters — use `for_each`
+- ❌ **Don't:** Commit `.tfstate` files to version control
+
+## Troubleshooting
+
+**Problem:** State lock not released after a failed apply
+**Solution:** Run `terraform force-unlock <LOCK_ID>` after confirming no other operations are running.