feat(tui): show usage by routed model

packages/opencode/test/cli/tui/usage.test.ts

@@ -1,61 +0,0 @@
-// kilocode_change - new file
-import { describe, expect, test } from "bun:test"
-import type { AssistantMessage, Message, UserMessage } from "@kilocode/sdk/v2"
-import { formatCount, getUsage } from "../../../src/cli/cmd/tui/routes/session/usage"
-
-function assistant(id: string, input: number, output: number, read: number): AssistantMessage {
-  return {
-    id,
-    sessionID: "ses_1",
-    role: "assistant",
-    time: { created: 1 },
-    parentID: "msg_parent",
-    modelID: "claude-sonnet",
-    providerID: "anthropic",
-    mode: "code",
-    agent: "code",
-    path: { cwd: "/tmp", root: "/tmp" },
-    cost: 0,
-    tokens: {
-      input,
-      output,
-      reasoning: 99,
-      cache: {
-        read,
-        write: 7,
-      },
-    },
-  }
-}
-
-function user(): UserMessage {
-  return {
-    id: "msg_user",
-    sessionID: "ses_1",
-    role: "user",
-    time: { created: 0 },
-    agent: "code",
-    model: {
-      providerID: "anthropic",
-      modelID: "claude-sonnet",
-    },
-  }
-}
-
-describe("session usage", () => {
-  test("sums input, output, and cache read across assistant messages only", () => {
-    const msg: Message[] = [user(), assistant("a", 1200, 45, 300), assistant("b", 800, 55, 700)]
-
-    expect(getUsage(msg)).toEqual({
-      input: 2000,
-      output: 100,
-      cached: 1000,
-    })
-  })
-
-  test("formats full counts with thousands separators", () => {
-    expect(formatCount(0)).toBe("0")
-    expect(formatCount(12345)).toBe("12,345")
-    expect(formatCount(9876543)).toBe("9,876,543")
-  })
-})