Add durable headless run registry

[chubes4]

Summary

• Adds a generic runtime run registry model for durable run status, heartbeat timestamps, replay metadata, and artifact bundle refs.
• Wires recipe-run to persist lifecycle status from queued through terminal states and return the run record in JSON output.
• Adds wp-codebox runs status and wp-codebox runs artifacts lookup commands for durable post-process inspection.

Tests

• npm run build
• npm run run-registry-smoke
• npm run recipe-runtime-evidence-smoke

Fixes #427.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafting and implementing the generic run registry slice, CLI lookup surface, and focused smoke coverage. Chris remains responsible for review and validation.