feat: expose canonical module display URLs

packages/module-ui-sdk/src/host-context.ts

@@ -75,6 +75,14 @@ export interface ModuleUiHostContext {
   /** The module this UI belongs to, as the host knows it. Supplied so a module never has to hardcode
    * or re-derive its own identity from a URL. */
   readonly moduleId: string;
+  /**
+   * The host-owned public page for this module's dedicated display, when one exists.
+   *
+   * The URL is already absolute and deployment-correct. A module may show, open, or copy it, but
+   * must never construct a platform route or combine its own id with a browser origin. A standalone
+   * host can provide its own display page here without imitating Ekklesia's routing.
+   */
+  readonly display: ModuleUiDisplayLocation | undefined;
   /** The only supported way for module UI to reach its own backend. See {@link ModuleUiApiClient}. */
   readonly api: ModuleUiApiClient;
   /** Who is viewing, for presentation decisions only. See {@link ModuleUiPrincipal} for why this is
@@ -96,6 +104,10 @@ export interface ModuleUiHostContext {
   readonly contributions: ModuleUiContributions;
 }
 
+export interface ModuleUiDisplayLocation {
+  readonly url: string;
+}
+
 /**
  * A module UI's access to its own module's HTTP API, addressed **relative to the module's own API
  * root** — never as an absolute path.