feat(devcontainer): add stopCompose shutdownAction for compose containers

[skevetter]

Summary

• Adds stopCompose as a distinct shutdownAction value per the devcontainer spec
• Compose containers default to stopCompose (all services stopped); stopContainer only stops the individual container
• Defines ShutdownActionNone, ShutdownActionStopContainer, ShutdownActionStopCompose constants, eliminating repeated string literals
• Delete path unchanged — always tears down all compose services regardless of shutdownAction
• Spec alignment: DEVSY-011 (P2 spec compliance)

[netlify]

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Configuration used: Organization UI

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Run ID: 03623414-b096-45a8-b1c5-c6faec13d8c8

📥 Commits

Reviewing files that changed from the base of the PR and between b51dbf6 and e08833b.

📒 Files selected for processing (12)

• cmd/agent/container/daemon.go
• cmd/agent/daemon.go
• e2e/tests/up-docker-compose/helper.go
• e2e/tests/up-docker-compose/testdata/docker-compose-shutdown-action-container/.devcontainer/devcontainer.json
• e2e/tests/up-docker-compose/testdata/docker-compose-shutdown-action-container/docker-compose.yaml
• e2e/tests/up-docker-compose/testdata/docker-compose-shutdown-action/.devcontainer/devcontainer.json
• e2e/tests/up-docker-compose/testdata/docker-compose-shutdown-action/docker-compose.yaml
• e2e/tests/up-docker-compose/up_docker_compose.go
• pkg/daemon/agent/daemon.go
• pkg/daemon/agent/daemon_test.go
• pkg/devcontainer/config/config.go
• pkg/devcontainer/delete.go

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