Adds synthetic source="test" tickets (create_test_shipment_order/delete_test_shipments)
carrying a company's real emailed-return-label SKU, so Step 1/Step 2 can be exercised
against the sandbox without a real JIRA ticket or risking a real customer's. Gated to
Test Mode - the same flow against production would create a real paid shipment.
CLAUDE.md also captures this session's ShipStation sandbox findings: store_id is
schema-optional but empirically required for label visibility, the newer ship15 web UI's
URL is NOT the se- store ID (confirmed via direct probe - different failure shape than a
wrong-but-well-formed ID), and two separate test stores/carriers are needed per company,
mirroring production.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
madminandClaude Sonnet 5
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