Arazzo import and workflow execution

[stationeros]

Problem

v1 imports OpenAPI operations, but not multi-step workflow descriptions.

Goal

Import Arazzo workflows and execute them as controlled task graphs.

Scope

• Arazzo parser and validation
• workflow-to-runtime translation
• step dependency execution
• step-level policy overrides

Acceptance criteria

• a valid Arazzo document can be imported
• dependent steps run in order with traceable execution state
• failures surface step-local status and retry history