Concurrent qualification runs could overwrite shared browser artifacts and authentication state, while an inherited PLAYWRIGHT_BASE_URL could send browser traffic outside the shell-owned stack. Scope outputs and fixture credentials to each invocation and clear that endpoint override so isolation evidence refers to the intended stack.
Focused runner checks cover inherited overrides and cleanup. Recorded concurrent Docker diagnostics reached healthy stacks but browser execution remained blocked by the existing multi-tenant quarantine; this test-only repair does not claim browser or release qualification and changes no user-visible application surface.
Change-source: pulse-maintainer
pulse-triage[bot]
a6a02847ef