feat(image-engine): add Sharp wrapper with 14 image operations

Operations: resize, crop, rotate, flip, convert, compress, strip-metadata,
brightness, contrast, saturation, color-channels, grayscale, sepia, invert.
Includes format detection, MIME mapping, metadata parsing, and engine orchestrator.

packages/image-engine/src/utils/metadata.ts

@@ -0,0 +1,28 @@
+import sharp from "sharp";
+import type { ImageInfo } from "../types.js";
+
+/**
+ * Extract comprehensive image metadata from a buffer.
+ */
+export async function getImageInfo(buffer: Buffer): Promise<ImageInfo> {
+  const metadata = await sharp(buffer).metadata();
+
+  return {
+    width: metadata.width ?? 0,
+    height: metadata.height ?? 0,
+    format: metadata.format ?? "unknown",
+    channels: metadata.channels ?? 0,
+    size: buffer.length,
+    hasAlpha: metadata.hasAlpha ?? false,
+    metadata: {
+      space: metadata.space,
+      density: metadata.density,
+      isProgressive: metadata.isProgressive,
+      hasProfile: metadata.hasProfile,
+      orientation: metadata.orientation,
+      exif: metadata.exif ? true : false,
+      icc: metadata.icc ? true : false,
+      xmp: metadata.xmp ? true : false,
+    },
+  };
+}