Why: A failed task card can appear before its notification turn, and the second finding must be observed while work is still running.
Evidence: The strengthened browser checks first exposed missing fixture notice text and a zero-width second-stage window; after fixture correction all six task-owned HTTP/Playwright scenarios passed. Frontend 265 unit tests and build passed.
Impact: Test coverage only; no production UI change.
Refs: U3 r0.4 independent review Important 5
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