fix(combo): detect images from Hermes and attachment payloads for Vision Adapter

Inspect images[], experimental_attachments/attachments, message-level
image/image_url/audio_url, and inline data:image|audio|pdf URIs on trailing
user turns so Vision Adapter auto-switch fires for Hermes/Ollama/Vercel AI
SDK shapes. stripOpenAI now also drops msg.images and image attachments when
the active model lacks vision support.

tests/unit/hermes-vision-detection.test.js

@@ -0,0 +1,115 @@
+import { describe, it, expect } from "vitest";
+import { detectRequiredCapabilities } from "../../open-sse/services/combo.js";
+import { augmentModelsWithCapacityAdapter } from "../../open-sse/services/capacityAdapter.js";
+import { stripUnsupportedModalities } from "../../open-sse/translator/concerns/modality.js";
+import { FORMATS } from "../../open-sse/translator/formats.js";
+
+describe("Hermes Vision Image Detection", () => {
+  it("detects vision from Ollama / Hermes images array", () => {
+    const body = {
+      messages: [
+        {
+          role: "user",
+          content: "Please analyze this image from Hermes",
+          images: ["iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg=="],
+        },
+      ],
+    };
+    const caps = detectRequiredCapabilities(body);
+    expect(caps.has("vision")).toBe(true);
+  });
+
+  it("detects vision from Vercel AI SDK / Hermes experimental_attachments", () => {
+    const body = {
+      messages: [
+        {
+          role: "user",
+          content: "Describe this attachment",
+          experimental_attachments: [
+            {
+              contentType: "image/png",
+              url: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==",
+            },
+          ],
+        },
+      ],
+    };
+    const caps = detectRequiredCapabilities(body);
+    expect(caps.has("vision")).toBe(true);
+  });
+
+  it("detects vision from Hermes attachments array", () => {
+    const body = {
+      messages: [
+        {
+          role: "user",
+          content: "Look at this photo",
+          attachments: [
+            {
+              mediaType: "image/jpeg",
+              url: "https://example.com/photo.jpg",
+            },
+          ],
+        },
+      ],
+    };
+    const caps = detectRequiredCapabilities(body);
+    expect(caps.has("vision")).toBe(true);
+  });
+
+  it("detects vision from embedded data:image URI in string content", () => {
+    const body = {
+      messages: [
+        {
+          role: "user",
+          content: "Here is an inline image: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==",
+        },
+      ],
+    };
+    const caps = detectRequiredCapabilities(body);
+    expect(caps.has("vision")).toBe(true);
+  });
+
+  it("auto-switches non-vision model (deepseek-v4-pro) to Vision Adapter model (Kimi-K3)", () => {
+    const body = {
+      messages: [
+        {
+          role: "user",
+          content: "Analyze image",
+          images: ["base64data..."],
+        },
+      ],
+    };
+    const reqCaps = detectRequiredCapabilities(body);
+    const settings = {
+      capacityAdapter: {
+        vision: {
+          enabled: true,
+          models: ["cmc/moonshotai/Kimi-K3"],
+        },
+      },
+    };
+
+    const augmented = augmentModelsWithCapacityAdapter(["cmc/deepseek/deepseek-v4-pro"], reqCaps, settings);
+    expect(augmented).toEqual(["cmc/moonshotai/Kimi-K3", "cmc/deepseek/deepseek-v4-pro"]);
+  });
+
+  it("strips msg.images and attachments when model does not support vision", () => {
+    const body = {
+      messages: [
+        {
+          role: "user",
+          content: "Test text",
+          images: ["base64..."],
+          experimental_attachments: [{ contentType: "image/png", url: "data:image/png;base64,..." }],
+        },
+      ],
+    };
+    const noVisionCaps = { vision: false, pdf: false, audioInput: false };
+
+    stripUnsupportedModalities(body, FORMATS.OPENAI, noVisionCaps);
+
+    expect(body.messages[0].images).toBeUndefined();
+    expect(body.messages[0].experimental_attachments).toHaveLength(0);
+  });
+});