feat(ai): Add image input tests for vision-capable models

- Added image tests to OpenAI Completions (gpt-4o-mini)
- Added image tests to Anthropic (claude-sonnet-4-0)
- Added image tests to Google (gemini-2.5-flash)
- Tests verify models can process and describe the red circle test image

packages/ai/scripts/generate-test-image.ts

@@ -0,0 +1,34 @@
+#!/usr/bin/env tsx
+
+import { createCanvas } from "canvas";
+import { writeFileSync } from "fs";
+import { join, dirname } from "path";
+import { fileURLToPath } from "url";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+// Create a 200x200 canvas
+const canvas = createCanvas(200, 200);
+const ctx = canvas.getContext("2d");
+
+// Fill background with white
+ctx.fillStyle = "white";
+ctx.fillRect(0, 0, 200, 200);
+
+// Draw a red circle in the center
+ctx.fillStyle = "red";
+ctx.beginPath();
+ctx.arc(100, 100, 50, 0, Math.PI * 2);
+ctx.fill();
+
+// Save the image
+const buffer = canvas.toBuffer("image/png");
+const outputPath = join(__dirname, "..", "test", "data", "red-circle.png");
+
+// Ensure the directory exists
+import { mkdirSync } from "fs";
+mkdirSync(join(__dirname, "..", "test", "data"), { recursive: true });
+
+writeFileSync(outputPath, buffer);
+console.log(`Generated test image at: ${outputPath}`);