Design the publishing flow for an internal Terraform module registry: what gates a release, and how do modules retire?

Registries live or die on upgrade ergonomics, not on publishing features. Green example plans gate every tag, automation delivers upgrade PRs with plan output to consumers, and retirement is a census plus a date.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.