a1851417d1
Add a test case driving the external-stack branch (external='true', no DB stackId) and assert the back-link carries external=true/type and omits stackId/regular. stackId/regular are set in the route params so the negative assertions actually catch a fall-through-to-regular regression. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>