feat: add Cloud Backup Service agent

[itlasso]

What does this PR do?

Adds a new Cloud Backup Service agent to the Engineering Division, specializing in provisioning and operating a managed cloud backup service on AWS S3 with per-client isolation, Terraform infrastructure, macOS and Windows scheduled backup scripts, SNS failure alerting, and secure pre-signed URL file retrieval.

Agent Information (if adding/modifying an agent)

• Agent Name: Cloud Backup Service Agent
• Category: Engineering
• Specialty: AWS S3 per-client bucket provisioning, Terraform modules for backup infrastructure, macOS launchd and Windows Task Scheduler backup automation, gzip compression, SNS email failure alerting, pre-signed URL client file retrieval, and Git repository management for multi-client backup services

Checklist

• Follows the agent template structure from CONTRIBUTING.md
• Includes YAML frontmatter with name, description, color
• Has concrete code/template examples (for new agents)
• Tested in real scenarios
• Proofread and formatted correctly

[itlasso]

@msitarzewski this agent was built from a real implementation — provisioning per-client AWS S3 buckets with Terraform, deploying scheduled backup scripts for both macOS (launchd) and Windows (Task Scheduler), SNS failure alerting, and pre-signed URL file retrieval. Happy to make any adjustments if needed!

[mhc222]

Code review

Found 1 issue:

1. Invalid HCL syntax in the Terraform output block — HCL does not support semicolons as attribute separators. The sensitive = true attribute on the same line as value will cause terraform validate to fail with a parse error. Each attribute must be on its own line:

output "iam_secret_key" {
  value     = module.iam.iam_secret_key
  sensitive = true
}

agency-agents/engineering/engineering-cloud-backup-service-agent.md

Lines 135 to 139 in 9079f68

	output "bucket_name" { value = module.s3_bucket.bucket_name }
	output "iam_access_key" { value = module.iam.iam_access_key }
	output "iam_secret_key" { value = module.iam.iam_secret_key; sensitive = true }
	output "sns_topic_arn" { value = module.sns_alerts.sns_topic_arn }
	```

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[itlasso]

@mhc222 — fixed the HCL output block syntax. Each attribute is now on its own line and the semicolon separator has been removed.

[itlasso]

@msitarzewski @mhc222 fixed all section headers with correct emoji prefixes and "Your" phrasing. Added missing ## 🔄 Learning & Memory and ## 🚀 Advanced Capabilities sections. Ready for re-review. Thanks!