chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/coding-agent/src/utils/image-convert.ts

@@ -0,0 +1,49 @@
+import { applyExifOrientation } from "./exif-orientation.ts";
+import { loadPhoton } from "./photon.ts";
+
+export async function convertImageBytesToPng(bytes: Uint8Array): Promise<Uint8Array | null> {
+	const photon = await loadPhoton();
+	if (!photon) {
+		// Photon not available, can't convert
+		return null;
+	}
+
+	try {
+		const rawImage = photon.PhotonImage.new_from_byteslice(bytes);
+		const image = applyExifOrientation(photon, rawImage, bytes);
+		if (image !== rawImage) rawImage.free();
+		try {
+			return new Uint8Array(image.get_bytes());
+		} finally {
+			image.free();
+		}
+	} catch {
+		// Conversion failed
+		return null;
+	}
+}
+
+/**
+ * Convert image to PNG format for terminal display.
+ * Kitty graphics protocol requires PNG format (f=100).
+ */
+export async function convertToPng(
+	base64Data: string,
+	mimeType: string,
+): Promise<{ data: string; mimeType: string } | null> {
+	// Already PNG, no conversion needed
+	if (mimeType === "image/png") {
+		return { data: base64Data, mimeType };
+	}
+
+	const bytes = new Uint8Array(Buffer.from(base64Data, "base64"));
+	const pngBytes = await convertImageBytesToPng(bytes);
+	if (!pngBytes) {
+		return null;
+	}
+
+	return {
+		data: Buffer.from(pngBytes).toString("base64"),
+		mimeType: "image/png",
+	};
+}