feat: Terraform Foundation - AWS Landing Zone

Enterprise-grade multi-tenant AWS cloud foundation.

Modules:
- GitHub OIDC for keyless CI/CD authentication
- IAM account settings and security baseline
- AWS Config Rules for compliance
- ABAC (Attribute-Based Access Control)
- SCPs (Service Control Policies)

Features:
- Multi-account architecture
- Cost optimization patterns
- Security best practices
- Comprehensive documentation

Tech: Terraform, AWS Organizations, IAM Identity Center

terraform/modules/route53-zone/README.md

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+# route53-zone
+
+Route53 Zone Module
+
+## Usage
+
+```hcl
+module "route53_zone" {
+  source = "../modules/route53-zone"
+  
+  # Required variables
+  domain_name = ""
+  records = ""
+  alias_records = ""
+  mx_records = ""
+
+  # Optional: see variables.tf for all options
+}
+```
+
+## Requirements
+
+| Name | Version |
+|------|---------|
+| terraform | >= 1.5.0 |
+| aws | >= 5.0 |
+
+## Inputs
+
+| Name | Description | Type | Required |
+|------|-------------|------|----------|
+| domain_name | Domain name for the hosted zone | `string` | yes |
+| comment | Comment for the hosted zone | `string` | no |
+| private_zone | Create a private hosted zone | `bool` | no |
+| vpc_ids | VPC IDs to associate with private zone | `list(string)` | no |
+| enable_dnssec | Enable DNSSEC signing | `bool` | no |
+| enable_query_logging | Enable query logging to CloudWatch | `bool` | no |
+| query_log_retention_days | Query log retention in days | `number` | no |
+| records |  | `map(object({` | yes |
+| alias_records |  | `map(object({` | yes |
+| mx_records |  | `list(object({` | yes |
+| txt_records |  | `map(string)` | no |
+| tags |  | `map(string)` | no |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| zone_id | Hosted zone ID |
+| zone_arn | Hosted zone ARN |
+| name_servers | Name servers for the zone (update at registrar) |
+| domain_name | Domain name |
+| dnssec_ds_record | DS record for DNSSEC (add to parent zone/registrar) |
+
+## License
+
+Apache 2.0 - See LICENSE for details.