Bifrost subscriber: listen for foundry.scaffold.requested events

[jordanpartridge]

What

Foundry registers itself as a Bifrost subscriber on boot. Any service that emits a foundry.scaffold.requested event gets a microservice scaffolded — no direct HTTP call needed.

How it works

Lexi (or any service)
  → emits foundry.scaffold.requested { manifest: {...} }
  → Bifrost receives + fans out
  → Foundry's ListenCommand picks it up from bifrost.foundry Redis channel
  → dispatches ScaffoldPipeline same as REST/MCP entry points

Acceptance Criteria

• ListenCommand subscribes to bifrost.foundry Redis pub/sub channel on boot
• Routes foundry.scaffold.requested events to ScaffoldPipeline
• Foundry registered as a subscriber in Bifrost on deploy
• Unrecognised event types logged and skipped gracefully
• 100% test coverage