Add the module navigation contract: manifest v9, module routes, return-to-origin

Stage 1 PR 7 (ADR 0063). A module becomes a first-class part of the Dashboard.

- Manifest v9 = v8 plus optional `navigation`: a Lucide icon from the curated
  MODULE_NAVIGATION_ICONS set, and up to 12 primary pages (stable id, safe
  label, kebab-case path relative to the module root; no traversal, schemes,
  queries, duplicates, or nesting). Validated before activation.
- Version 8 stays accepted beside version 9, each read strictly as itself
  (discriminated union); no released manifest is rewritten. The template
  moves to v9; the released Signage 0.1.5 manifest is a test fixture.
- Real module routes: /<id> is the landing view, /<id>/<page> a declared
  page, anything beneath a page a module-owned detail route; anything else
  is not-found and mounts nothing. api/assets/display are never pages.
- Sidebar: declared icons, pages nested under an open module, one
  aria-current, collapsed and drawer behaviour; v8 modules unchanged.
- module-ui-sdk: ModuleUiHostContext.navigation (location, subscribe,
  navigate, link, settings), refusing anything outside the module's routes;
  undefined on the display host. Mount ABI unchanged.
- Return-to-origin: one `?return=` carrier on Settings URLs, validated by
  parseReturnTarget and against running modules' declared routes; Settings
  Back returns to exactly the originating module page, across refreshes.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

core/tests/module-discovery.test.ts

@@ -1,6 +1,8 @@
-import { mkdir, mkdtemp, rm, symlink, writeFile } from "node:fs/promises";
+import { mkdir, mkdtemp, readFile, rm, symlink, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { moduleManifestNavigation } from "@ekklesia/contracts";
 import { afterEach, describe, expect, it } from "vitest";
 import {
   discoverModules,
@@ -1220,3 +1222,107 @@ describe("browser contribution artifact resolution", () => {
     });
   });
 });
+
+describe("manifest v8 and v9 side by side (ADR 0063)", () => {
+  const releasedSignageManifest = path.join(
+    path.dirname(fileURLToPath(import.meta.url)),
+    "..",
+    "..",
+    "packages",
+    "contracts",
+    "tests",
+    "fixtures",
+    "released-v8-signage-0.1.5.module.json",
+  );
+
+  it("discovers the released Signage 0.1.5 module exactly as published, with no navigation", async () => {
+    const modulesDirectory = await createModulesDirectory();
+    const manifest = JSON.parse(await readFile(releasedSignageManifest, "utf8")) as Record<
+      string,
+      unknown
+    >;
+    await createModule(modulesDirectory, "signage", {
+      extraFiles: {
+        "dist/display/index.js": "export default {};\n",
+        "dist/schema/index.js": "export {};\n",
+        "dist/ui/index.js": "export default {};\n",
+        "drizzle/meta/_journal.json": JSON.stringify({
+          dialect: "postgresql",
+          entries: [],
+          version: "7",
+        }),
+      },
+      manifest,
+      packageJson: {
+        ekklesia: { layer: "module" },
+        name: "@zayin/signage",
+        type: "module",
+        version: manifest.version,
+      },
+      serverSource: 'export default { id: "signage", version: "0.1.5" };',
+    });
+
+    const [signage] = await discoverModules({
+      moduleSdkVersion: "0.2.5",
+      modulesDirectory,
+      platformVersion: "0.2.5",
+    });
+
+    expect(signage?.manifest.manifestVersion).toBe(8);
+    expect(signage?.entrypoints.ui).toBeDefined();
+    expect(moduleManifestNavigation(signage?.manifest ?? { manifestVersion: 8 })).toEqual({
+      pages: [],
+    });
+    // Its settings, which Settings → Modules lists (ADR 0061), are read exactly as before.
+    expect(signage?.manifest.configuration.map((declaration) => declaration.key)).toEqual(
+      (manifest.configuration as { key: string }[]).map((declaration) => declaration.key),
+    );
+  });
+
+  it("discovers a manifest v9 module with its declared icon and pages", async () => {
+    const modulesDirectory = await createModulesDirectory();
+    await createModule(modulesDirectory, "media", {
+      extraFiles: { "dist/ui/index.js": "export default {};\n" },
+      manifest: {
+        ...manifestFor("media"),
+        entrypoints: { server: "./dist/server/index.js", ui: "./dist/ui/index.js" },
+        manifestVersion: 9,
+        navigation: {
+          icon: "images",
+          pages: [
+            { id: "sermons", label: "Sermons", path: "sermons" },
+            { id: "library", label: "Library", path: "library" },
+          ],
+        },
+      },
+    });
+
+    const [media] = await discoverModules({
+      moduleSdkVersion: "0.1.0",
+      modulesDirectory,
+      platformVersion: "0.1.0",
+    });
+
+    expect(media?.manifest.manifestVersion).toBe(9);
+    const navigation = moduleManifestNavigation(media?.manifest ?? { manifestVersion: 9 });
+    expect(navigation.icon).toBe("images");
+    expect(navigation.pages.map((page) => page.path)).toEqual(["sermons", "library"]);
+    // Deeply frozen like the rest of a discovered manifest.
+    expect(Object.isFrozen(navigation.pages)).toBe(true);
+  });
+
+  it("refuses a manifest v9 module whose navigation escapes its own namespace", async () => {
+    const modulesDirectory = await createModulesDirectory();
+    await createModule(modulesDirectory, "media", {
+      extraFiles: { "dist/ui/index.js": "export default {};\n" },
+      manifest: {
+        ...manifestFor("media"),
+        entrypoints: { server: "./dist/server/index.js", ui: "./dist/ui/index.js" },
+        manifestVersion: 9,
+        navigation: { pages: [{ id: "out", label: "Out", path: "../settings" }] },
+      },
+    });
+
+    expect(issueCodes(await discoveryError(modulesDirectory))).toEqual(["MODULE_MANIFEST_INVALID"]);
+  });
+});