feat(extensions): add ty-openworkflow for ephemeral compute workflows

[bborn]

Summary

• Add ty-openworkflow extension following the OpenWorkflow architecture pattern
• Enable tasks to spawn durable, fault-tolerant workflows on ephemeral compute platforms
• Support for multiple compute backends: local exec, Docker, and Cloudflare Workers
• Full TaskYou integration via CLI bridge for task tracking

Key Features

OpenWorkflow Architecture

Based on openworkflow/openworkflow:

• Deterministic replay: Steps are memoized and can be replayed from any checkpoint
• Durable sleep: Workflows can pause and resume across process restarts
• Fault tolerance: Crashed workers are automatically recovered

Compute Adapters

Adapter	Description	Use Case
exec	Local Node.js/Python processes	Development, testing
docker	Isolated containers	Self-hosted production
cloudflare	Cloudflare Workers (edge)	Serverless, global distribution

TaskYou Integration

• Workflows can be linked to tasks for tracking
• Task status updates automatically when workflows complete/fail
• Bridge communicates via ty CLI (sidecar pattern)

Files Changed

extensions/ty-openworkflow/
├── cmd/main.go              # CLI with serve, deploy, start, status commands
├── config.example.yaml      # Example configuration
├── internal/
│   ├── bridge/bridge.go     # TaskYou CLI bridge
│   ├── compute/
│   │   ├── compute.go       # Adapter interface
│   │   ├── exec.go          # Local process adapter
│   │   ├── docker.go        # Docker container adapter
│   │   └── cloudflare.go    # Cloudflare Workers adapter
│   ├── config/config.go     # Configuration handling
│   ├── runner/runner.go     # Workflow orchestration
│   └── state/state.go       # SQLite state management
└── README.md                # Documentation

Test plan

• Unit tests pass for compute, config, and state packages
• Binary compiles successfully
• Manual test: deploy and run a workflow locally with exec adapter
• Manual test: verify TaskYou task integration

Example Usage

# Initialize config
ty-openworkflow init

# Deploy a workflow
cat <<'WORKFLOW' | ty-openworkflow deploy my-workflow -f -
async function workflow(input, { step, sleep }) {
  const greeting = await step("greet", () => "Hello, " + input.name);
  await sleep("wait", 5000);
  return { message: greeting };
}
WORKFLOW

# Start a run linked to a task
ty-openworkflow start my-workflow -i '{"name": "World"}' --create-task

# Check status
ty-openworkflow status <run-id>

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