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Signed-off-by: Onur Özkan <work@onurozkan.dev>

ground-suite/src/core/data-plane/eventValidation.test.ts

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+import { describe, expect, it } from 'vitest';
+import { validateEvent } from './eventValidation';
+describe('event validation', () => {
+  it.each([
+    [{}, 'Unsupported event schema'],
+    [{ schemaVersion: 1 }, 'Missing envelope identity'],
+    [{ schemaVersion: 1, eventId: 'a', streamId: 's', entity: {}, sequence: -1 }, 'Invalid monotonic sequence'],
+  ])('rejects malformed envelopes', (value, reason) => expect(validateEvent(value)).toEqual({ valid: false, reason }));
+});