fix(ImageShowTool): read local file to buffer before Jimp.read

Jimp v1.x has inconsistent path resolution in some runtimes (Bun, ESM).
Read file to Buffer via fs.readFileSync first, then pass to Jimp.read()
to ensure reliable local file loading.

Co-Authored-By: Claude Big Pickle <noreply@anthropic.com>

src/tools/ImageShowTool/ImageShowTool.ts

@@ -1,4 +1,5 @@
 import { execFileSync } from 'child_process'
+import fs from 'node:fs'
 import { z } from 'zod/v4'
 import { Jimp } from "jimp";
 import { buildTool, type ToolDef } from '../../Tool.js'
@@ -51,7 +52,12 @@ export async function loadImage(path: string) {
   if (isUrl(path)) {
     return loadImageFromUrl(path);
   } else {
-    return Jimp.read(path);
+    // Read file to Buffer first, then pass to Jimp.read().
+    // Jimp v1.x has inconsistent path resolution in some runtimes
+    // (Bun, ESM contexts), so this avoids relying on Jimp's internal
+    // file detection by feeding the raw buffer directly.
+    const buffer = fs.readFileSync(path);
+    return Jimp.read(buffer);
   }
 }