chore: establish Ekklesia platform foundation

tests/boundaries.test.ts

@@ -0,0 +1,32 @@
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+import { checkBoundaries } from "../scripts/check-boundaries.js";
+
+const testDirectory = path.dirname(fileURLToPath(import.meta.url));
+const fixtures = path.join(testDirectory, "fixtures", "boundaries");
+
+describe("repository dependency boundaries", () => {
+  it("accepts public contracts below Core", async () => {
+    const result = await checkBoundaries(path.join(fixtures, "legal"));
+    expect(result.violations).toEqual([]);
+  });
+
+  it.each([
+    ["core-imports-module", "core-is-feature-agnostic"],
+    ["module-imports-surface", "modules-use-public-platform-contracts"],
+    ["cross-module-import", "modules-do-not-import-other-modules"],
+    ["module-has-ui", "modules-do-not-own-ui"],
+    ["cycle", "no-circular-source-dependencies"],
+  ])("rejects %s", async (fixture, expectedRule) => {
+    const result = await checkBoundaries(path.join(fixtures, fixture));
+    expect(result.violations.map((violation) => violation.rule)).toContain(expectedRule);
+  });
+
+  it("rejects both component and stylesheet files inside a module", async () => {
+    const result = await checkBoundaries(path.join(fixtures, "module-has-ui"));
+    expect(
+      result.violations.filter((violation) => violation.rule === "modules-do-not-own-ui"),
+    ).toHaveLength(2);
+  });
+});