Records the decision to make docker-compose.prod.yml a fully self-contained
file rather than an overlay over docker-compose.yml. Captures the cost
(env-var duplication across dev and prod files) and the benefit (single
file the reviewer can hold in their head, no Compose merge-rule
surprises, automatic project-name namespacing for cohabiting staging +
production on one host).
Surfaces the retirement of the earlier overlay narrative in
docs/infrastructure/production-compose.md so a future maintainer does
not reverse the choice out of ignorance.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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