feat: add Dashboard navigation as presentation configuration

Phase 6D pass 1. The shell's navigation was a flat list of module ids, which
is not a usable experience — and the obvious fix carries an obvious trap.
Letting a module declare its folder, or modelling "Media" as something
Livestream and Video belong to, turns a rendering preference into
architecture: a folder becomes an owner, membership starts to look like a
dependency, and the flat module graph acquires a hierarchy nobody decided on.

So the rule comes first: a Dashboard group is a label on a rendering bucket.
No manifest, no version, no artifact, no API, no lifecycle; nothing depends on
it. Livestream depends on Video because it calls Video's functionality, and
that orders startup. Livestream is shown under Media, and that orders nothing.
No parent module, child module, owning module, or group-derived dependency
appears anywhere in the contracts.

No manifest change and no version 5. `manifest.name` has been required since
version 1 and already is the module's product identity, so the shell renders
"Livestream" instead of `livestream` with nothing added. `suggestedGroup` is
deliberately deferred rather than shipped: it would force a hard
manifest-version cutover for a hint, and its only correct semantics needs
initialization logic that risks a suggestion overwriting an administrator's
decision. Defaulting and ownership are different things.

Two Core tables (migration 0003) hold groups and placements — server-side,
because a church configures its Dashboard rather than one browser;
platform-global, because no organization model exists to scope them to.
`group_id` is `on delete set null`, so deleting a group ungroups its modules
and a dangling reference is impossible. `module_id` carries no foreign key,
because modules are packages rather than rows, so a placement for an
uninstalled module is retained and restores its position on reinstall.

`resolveDashboardNavigation` is a pure function of configuration plus the
mountable set: an unplaced module is ungrouped and visible with no
initialization write, an absent module renders nothing, empty groups are kept,
and ordering is total with the module id as final tie-break.

`GET /api/v1/dashboard/navigation` returns the resolved view, layered on top of
the host-neutral module UI inventory rather than merged into it — each generic
descriptor is embedded untouched, so a standalone host never inherits Dashboard
semantics. Reading needs the permission the inventory already needs; organizing
needs the new platform permission `core.dashboard.navigation.manage` through a
narrow, idempotent, closed-validation mutation contract. No editor UI.

The flatness rule is executable: a test discovers real fixtures with a genuine
dependency, arranges them four ways including both in one folder and the
dependency inverted in presentation, and asserts discovery order, dependency
declarations, and the module set stay byte-identical. The end-to-end test
organizes a real installation through the real API, mounts a module from inside
a group, moves it, and asserts the navigation entry is byte-identical across the
move and still mounts the same artifact.

The shell's client for the generic inventory became dead code and was removed
rather than kept speculatively; the endpoint itself is unchanged.

Co-Authored-By: Claude Opus 5 <[email protected]>

apps/api/src/module-ui-inventory.ts

@@ -120,6 +120,38 @@ async function describeModule(
   };
 }
 
+/** One mountable module, described once: the host-neutral mount descriptor plus the module's own
+ * display name, kept beside it rather than inside it. */
+export interface MountableModuleDescription {
+  readonly descriptor: HostModuleUiDescriptor;
+  /** `manifest.name`. Presentation *identity* the module owns — never its placement, which the
+   * Dashboard owns (ADR 0027). Deliberately absent from `HostModuleUiDescriptor`, so the
+   * host-neutral contract a standalone host consumes stays free of presentation concerns. */
+  readonly name: string;
+}
+
+/**
+ * The one composition of the mountable-module set, shared by the generic inventory route and the
+ * Dashboard navigation route (`./dashboard-routes.js`).
+ *
+ * Both derive from the same publication registry and the same evaluator, so the two endpoints can
+ * never disagree about what exists, what its URLs are, or what the caller may do inside it. Sharing
+ * this function rather than duplicating the mapping is what makes that a structural property instead
+ * of a convention.
+ */
+export async function describeMountableModules(
+  evaluator: AuthorizationMiddlewareOptions["evaluator"],
+  principal: EkklesiaPrincipal,
+  registry: ModuleUiPublicationRegistry,
+): Promise<readonly MountableModuleDescription[]> {
+  return Promise.all(
+    registry.list().map(async (published) => ({
+      descriptor: await describeModule(evaluator, principal, published),
+      name: published.name,
+    })),
+  );
+}
+
 /** Mirrors `requirePermission`'s own infrastructure-failure result exactly: a permission hint that
  * could not be determined is never reported as "not granted". Carries no module id, permission id,
  * or caught error. */
@@ -178,11 +210,14 @@ export function createModuleUiInventoryRoutes(options: CreateModuleUiInventoryRo
     // The `authenticated` baseline guarantees this is an authenticated principal.
     const principal = getAuthorizedPrincipal(c);
     try {
-      const modules = await Promise.all(
-        options.moduleUi
-          .list()
-          .map((published) => describeModule(options.evaluator, principal, published)),
+      const described = await describeMountableModules(
+        options.evaluator,
+        principal,
+        options.moduleUi,
       );
+      // Only the host-neutral descriptor reaches this response: the display name stays out of the
+      // portable contract and is carried by the Dashboard navigation view instead.
+      const modules = described.map((entry) => entry.descriptor);
       return c.json({ modules } satisfies HostModuleUiInventory, 200);
     } catch {
       return sanitizedInventoryFailure(c);