Add compose commands

[sjmiller609]

Summary

• add hypeman compose plan, hypeman compose up, and hypeman compose down
• load a v1 compose manifest for services, env interpolation, resources, restart policy, healthcheck, and ingress
• tag managed instances and ingresses with compose metadata and spec hashes for idempotent reapply
• create instances through a raw payload path so new instance policy fields can be passed before the generated SDK catches up
• document an OTel collector compose example

Testing

• go test ./...
• ./scripts/lint
• ./scripts/build