Artifact: Burndown Diagnosis — Sprint 2

Aurora Checkout Redesign -- burndown diagnosis -- exercises co-09.

Day	Remaining points	Note
4	8	On pace.
5	8	Flatline begins.
6	8	Flatline continues.
7	8	Flatline continues -- three full days with zero progress logged.
8	5	Resumes dropping.

Cause: the shared staging environment was down for two of the three flatlined days, waiting on a security patch from the platform team. No individual story looked "blocked" until someone actually needed to deploy and test against staging on day 6.

Corrective action: add "is the staging environment healthy" as a standing standup check-in item, and escalate infrastructure issues within four working hours of discovery instead of waiting for them to visibly block a specific story.