feat: add seam carving AI bridge module

packages/ai/src/index.ts

@@ -3,4 +3,5 @@ export { isGpuAvailable, shutdownDispatcher } from "./bridge.js";
 export { blurFaces } from "./face-detection.js";
 export { inpaint } from "./inpainting.js";
 export { extractText } from "./ocr.js";
+export { seamCarve } from "./seam-carving.js";
 export { upscale } from "./upscaling.js";

packages/ai/src/seam-carving.ts

@@ -0,0 +1,44 @@
+import { readFile, writeFile } from "node:fs/promises";
+import { join } from "node:path";
+import { type ProgressCallback, runPythonWithProgress } from "./bridge.js";
+
+export interface SeamCarveOptions {
+  width?: number;
+  height?: number;
+  protectFaces?: boolean;
+}
+
+export interface SeamCarveResult {
+  buffer: Buffer;
+  width: number;
+  height: number;
+}
+
+export async function seamCarve(
+  inputBuffer: Buffer,
+  outputDir: string,
+  options: SeamCarveOptions = {},
+  onProgress?: ProgressCallback,
+): Promise<SeamCarveResult> {
+  const inputPath = join(outputDir, "input_seam_carve.png");
+  const outputPath = join(outputDir, "output_seam_carve.png");
+
+  await writeFile(inputPath, inputBuffer);
+  const { stdout } = await runPythonWithProgress(
+    "seam_carve.py",
+    [inputPath, outputPath, JSON.stringify(options)],
+    { onProgress },
+  );
+
+  const result = JSON.parse(stdout);
+  if (!result.success) {
+    throw new Error(result.error || "Content-aware resize failed");
+  }
+
+  const buffer = await readFile(outputPath);
+  return {
+    buffer,
+    width: result.width,
+    height: result.height,
+  };
+}