Read AGENTS.md first, before doing anything else in this repo.
It is the single source of truth for the architecture, directory layout, build &
test loop, and the coding conventions you are required to follow here. Do not
propose changes or write code until you have read it.
Per-module AGENTS.md files (e.g. src/odr/internal/oldms/presentation/AGENTS.md)
carry deeper, area-specific rules — read the relevant one before touching that
module, as AGENTS.md instructs.