feat: Preview Containers

[jnarowski]

Implements Docker-based preview environments with full lifecycle management.

Summary

• Added Container model and preview_config to database
• Implemented complete container orchestration services (create/stop/query)
• Integrated step.preview() into workflow SDK
• Built REST API routes for container management
• Created frontend UI for viewing/managing previews
• Full test coverage (60+ tests passing)

Key Features

• Docker Compose and Dockerfile support
• Named port allocation (5000-5999 range)
• Project-level preview configuration
• Real-time WebSocket updates
• Multiple concurrent previews per project
• Cascade cleanup on project/workflow deletion

Testing

All phases completed with comprehensive test coverage:

• Phase 1: Database schema and types (migration applied)
• Phase 2: Core services with 60+ passing tests
• Phase 3: Workflow SDK integration
• Phase 4: API routes with validation
• Phase 5: Frontend UI components

See spec: .agent/specs/done/2511271430-preview-containers/spec.md

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Project	Deployment	Preview	Comments	Updated (UTC)
agentcmd-website	Ready	Preview	Comment	Nov 28, 2025 4:59pm