docs(08-02): add E2E test module index

- Documents test module structure
- Lists test files and their purposes

src/test/e2e/index.ts

@@ -0,0 +1,12 @@
+/**
+ * E2E Tests for Dispatch/Coordination Flows
+ *
+ * Test files:
+ * - happy-path.test.ts: Normal operation scenarios
+ * - edge-cases.test.ts: Error handling and edge cases
+ *
+ * Uses TestHarness from src/test/ for system wiring.
+ */
+
+// No exports needed - tests are self-contained
+export {};