Preserve ultrawork runtime variants

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/keyword-detector/ultrawork-runtime-variant.test.ts

@@ -0,0 +1,57 @@
+import { describe, expect, test } from "bun:test"
+import { createKeywordDetectorHook } from "./index"
+import { _resetForTesting, setMainSession } from "../../features/claude-code-session-state"
+
+function createMockPluginInput(toastMessages: string[]) {
+  return {
+    client: {
+      tui: {
+        showToast: async (opts: { body: { message: string } }) => {
+          toastMessages.push(opts.body.message)
+        },
+      },
+    },
+  } as any
+}
+
+describe("keyword-detector ultrawork runtime variant gating", () => {
+  test("#given runtime max variant #when ultrawork activates #then maximum precision toast is preserved", async () => {
+    // given
+    _resetForTesting()
+    setMainSession("main-session")
+    const toastMessages: string[] = []
+    const hook = createKeywordDetectorHook(createMockPluginInput(toastMessages))
+    const output = {
+      message: { variant: "max" } as Record<string, unknown>,
+      parts: [{ type: "text", text: "ultrawork do it" }],
+    }
+
+    // when
+    await hook["chat.message"]({ sessionID: "main-session", variant: "max" }, output)
+
+    // then
+    expect(output.message.variant).toBe("max")
+    expect(toastMessages).toEqual(["Maximum precision engaged. All agents at your disposal."])
+    _resetForTesting()
+  })
+
+  test("#given runtime non-max variant #when ultrawork activates #then variant stays unchanged and toast does not claim max", async () => {
+    // given
+    _resetForTesting()
+    setMainSession("main-session")
+    const toastMessages: string[] = []
+    const hook = createKeywordDetectorHook(createMockPluginInput(toastMessages))
+    const output = {
+      message: { variant: "medium" } as Record<string, unknown>,
+      parts: [{ type: "text", text: "ultrawork do it" }],
+    }
+
+    // when
+    await hook["chat.message"]({ sessionID: "main-session", variant: "medium" }, output)
+
+    // then
+    expect(output.message.variant).toBe("medium")
+    expect(toastMessages).toEqual(["Runtime variant preserved. All agents at your disposal."])
+    _resetForTesting()
+  })
+})