chore: import upstream snapshot with attribution

apps/sim/lib/copilot/vfs/file-reader.test.ts

@@ -0,0 +1,65 @@
+/**
+ * @vitest-environment node
+ */
+
+import { randomFillSync } from 'node:crypto'
+import { loggerMock } from '@sim/testing'
+import { describe, expect, it, vi } from 'vitest'
+
+const { fetchWorkspaceFileBuffer } = vi.hoisted(() => ({
+  fetchWorkspaceFileBuffer: vi.fn(),
+}))
+
+vi.mock('@sim/logger', () => loggerMock)
+vi.mock('@/lib/uploads/contexts/workspace/workspace-file-manager', () => ({
+  fetchWorkspaceFileBuffer,
+}))
+
+import { readFileRecord } from '@/lib/copilot/vfs/file-reader'
+
+const MAX_IMAGE_READ_BYTES = 5 * 1024 * 1024
+
+async function makeNoisePng(width: number, height: number): Promise<Buffer> {
+  const sharp = (await import('sharp')).default
+  const raw = Buffer.alloc(width * height * 3)
+  randomFillSync(raw)
+  return sharp(raw, { raw: { width, height, channels: 3 } })
+    .png()
+    .toBuffer()
+}
+
+const SHARP_TEST_TIMEOUT_MS = 30_000
+
+describe('readFileRecord', () => {
+  it(
+    'downscales oversized images into attachments that fit the read limit',
+    async () => {
+      const largePng = await makeNoisePng(1800, 1800)
+      expect(largePng.length).toBeGreaterThan(MAX_IMAGE_READ_BYTES)
+
+      fetchWorkspaceFileBuffer.mockResolvedValue(largePng)
+
+      const result = await readFileRecord({
+        id: 'wf_large',
+        workspaceId: 'ws_1',
+        name: 'chesspng.png',
+        key: 'uploads/chesspng.png',
+        path: '/api/files/serve/uploads%2Fchesspng.png?context=mothership',
+        size: largePng.length,
+        type: 'image/png',
+        uploadedBy: 'user_1',
+        uploadedAt: new Date(),
+        deletedAt: null,
+        storageContext: 'mothership',
+      })
+
+      expect(result?.attachment?.type).toBe('image')
+      expect(result?.content).toContain('resized for vision')
+
+      const decoded = Buffer.from(result?.attachment?.source.data ?? '', 'base64')
+      expect(decoded.length).toBeLessThanOrEqual(MAX_IMAGE_READ_BYTES)
+      expect(result?.attachment?.source.media_type).toMatch(/^image\/(jpeg|webp|png)$/)
+    },
+    SHARP_TEST_TIMEOUT_MS
+  )
+})