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Module pages move from `/modules/<id>` to `/<module-id>` (`/signage`), beside `/settings` and `/account`, so the implementation concept "module" never appears in a user-facing address. ADR 0057 is rewritten to match. - Core reserves the top-level names the platform actually serves today (`account`, `api`, `assets`, `display`, `settings`), and discovery refuses a module that declares one with `MODULE_ID_RESERVED`. That covers startup, `modules:validate`, and package verification. Tests in `apps/api` hold the set to every top-level route the API registers and every page the shell interprets. - The API serves the Dashboard page at `/<module-id>` and below only for modules discovered with a Dashboard UI, enabled or not: a disabled module's bookmark still opens the Dashboard, which says it is unavailable. An arbitrary root path such as `/definitely-not-a-real-module` stays the sanitized 404. - Both reference proxies forward every top-level path shaped like a module id and let the API decide; the split Dashboard hostname still refuses `/api`, `/display`, and `/assets`. Installing a module needs no proxy change. - `/<module-id>/<page>` is already served and forwarded, so a later module sub-page contract needs no routing or deployment change; the shell shows "Page not found" there until it exists. - The deploy smoke checks a module's address before install, while installed, while disabled, after removal, and after reinstall, plus unknown names and the old `/modules/…` form through the real proxy. Co-Authored-By: Claude Opus 5.5 <[email protected]>