Artifact: Team Culture Norm Change — Blameless Postmortems

A proposed culture-norm change plus the mechanism that makes it stick -- exercises co-15. Everline and every name here are fictional; every quote is an illustrative, constructed example.

The norm: every production incident above a stated severity gets a written postmortem that names contributing factors and system gaps, never an individual's mistake as the root cause.

The mechanism that makes it stick (not just a one-time announcement): postmortem-facilitator duty rotates weekly across the team, tracked on the same shared calendar the on-call rotation already uses. Whoever is on facilitator duty that week runs the postmortem for any incident that happens during it -- not the engineer who was involved, and not always Priya. The rotation makes "who runs this" a standing team responsibility, not a thing that depends on Priya remembering to announce it or personally showing up every time.