Add registry kind indexes and entity pages.

CONTENT-WP-0002-T02 reads kinds from each snapshot and serves both example dataspaces without oncology imports.

Assistant: grok
Assistant-Session: 01a1346c-fdff-7741-b1af-b7283661554b

ui/lib/catalog.test.ts

@@ -0,0 +1,34 @@
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+import { describe, expect, it } from "vitest";
+import { entitySlug, findDataspace, findEntity, findKind } from "./catalog";
+
+const root = join(process.cwd(), "../examples/dataspaces");
+
+function titles(dataspaceId: string, kindId: string): string[] {
+  const snapshot = JSON.parse(readFileSync(join(root, dataspaceId, "snapshot.json"), "utf8")) as {
+    entities: { kindId: string; title: string }[];
+  };
+  return snapshot.entities.filter((entity) => entity.kindId === kindId).map((entity) => entity.title).sort();
+}
+
+describe("catalog", () => {
+  it("takes the kind index from the snapshot registry", () => {
+    const concept = findKind("systems-thinking", "concept");
+    const pattern = findKind("software-architecture", "pattern");
+    expect(concept?.plural).toBe("Concepts");
+    expect(concept?.rows.map((row) => row.title).sort()).toEqual(titles("systems-thinking", "concept"));
+    expect(pattern?.rows.map((row) => row.title).sort()).toEqual(titles("software-architecture", "pattern"));
+    expect(concept?.rows.every((row) => row.href?.startsWith("/systems-thinking/concept/"))).toBe(true);
+  });
+
+  it("resolves one entity and hides unknown routes", () => {
+    expect(entitySlug("urn:ce:systems-thinking:concept:system-boundary", "concept")).toBe("system-boundary");
+    const feedback = findEntity("systems-thinking", "concept", "feedback");
+    expect(feedback?.title).toBe("Feedback");
+    expect(feedback?.relations.some((relation) => relation.otherTitle === "Causal loop diagram")).toBe(true);
+    expect(findEntity("systems-thinking", "concept", "missing")).toBeNull();
+    expect(findKind("systems-thinking", "no-such-kind")).toBeNull();
+    expect(findDataspace("software-architecture")?.title).toBe("Software Architecture");
+  });
+});