feat: Workflow Control Plane V1 - Governance gates for external orchestrators

[saurabhjain1592]

Summary

"LangChain runs the workflow. AxonFlow decides when it's allowed to move forward."

Workflow Control Plane V1 - Governance gates for external orchestrators like LangChain, LangGraph, and CrewAI at workflow step transitions.

Features

• Register workflows from external orchestrators
• Check step gates before each workflow step (allow/block/require_approval)
• Apply policies at step transitions with new workflow scope
• Track workflow lifecycle (in_progress/completed/aborted/failed)

Platform Changes

• New workflow_control package with types, repository, service, handlers
• Database migration for workflows and workflow_steps tables

• 80% test coverage

SDK Support

• Go SDK: workflows.go with full Workflow Control Plane API
• TypeScript SDK: types/workflows.ts + client methods

Examples

• HTTP/curl, Go, Python, TypeScript, Java examples
• LangGraph adapter example for Python

Documentation

• ADR-019: Workflow Control Plane architecture decision
• API spec updates in orchestrator-api.yaml
• User guide: docs/guides/workflow-control-plane.md

API Endpoints

POST /api/v1/workflows                           - Create workflow
GET  /api/v1/workflows/{id}                      - Get workflow status
POST /api/v1/workflows/{id}/steps/{sid}/gate     - Check step gate
POST /api/v1/workflows/{id}/steps/{sid}/complete - Mark step completed
POST /api/v1/workflows/{id}/complete             - Complete workflow
POST /api/v1/workflows/{id}/abort                - Abort workflow
POST /api/v1/workflows/{id}/resume               - Resume workflow
GET  /api/v1/workflows                           - List workflows

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Source commits: 0922eda, 70edeb2
Enterprise PR: #1013

Authored-by: Saurabh Jain saurabh@getaxonflow.com
Co-authored-by: AxonFlow Team bot@getaxonflow.com

[saurabhjain1592]

Closing - CHANGELOG needs Workflow Control Plane entry before re-sync