Build a store from a brief

# 1. Start the build
JOB=$(curl -s -X POST https://api.platformdtc.com/api/v1/agent/v1/projects \
  -H "X-Agent-Key: sq_agt_xxx" -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{"name":"Aurora Skincare","brief":"Minimalist sage skincare, hero on the vitamin-C serum, 6 products","init_agent_type":"store"}' \
  | jq -r '.data.job_id')

# 2. Wait for completion
curl -s "https://api.platformdtc.com/api/v1/agent/v1/jobs/$JOB/wait?timeout_seconds=240" \
  -H "X-Agent-Key: sq_agt_xxx" | jq '.data'
# { "status": "succeeded", "result": { "project_id": "P1", "preview_ready": true } }