fix(config-manager): support silent bun install execution

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

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

src/cli/config-manager/bun-install.test.ts

@@ -1,10 +1,25 @@
-import { beforeEach, afterEach, describe, expect, it, spyOn } from "bun:test"
 import * as fs from "node:fs"
+
+import { afterEach, beforeEach, describe, expect, it, spyOn } from "bun:test"
+
 import * as dataPath from "../../shared/data-path"
 import * as logger from "../../shared/logger"
 import * as spawnHelpers from "../../shared/spawn-with-windows-hide"
 import { runBunInstallWithDetails } from "./bun-install"
 
+function createProc(
+  exitCode: number,
+  output?: { stdout?: string; stderr?: string }
+): ReturnType<typeof spawnHelpers.spawnWithWindowsHide> {
+  return {
+    exited: Promise.resolve(exitCode),
+    exitCode,
+    stdout: output?.stdout !== undefined ? new Blob([output.stdout]).stream() : undefined,
+    stderr: output?.stderr !== undefined ? new Blob([output.stderr]).stream() : undefined,
+    kill: () => {},
+  } satisfies ReturnType<typeof spawnHelpers.spawnWithWindowsHide>
+}
+
 describe("runBunInstallWithDetails", () => {
   let getOpenCodeCacheDirSpy: ReturnType<typeof spyOn>
   let logSpy: ReturnType<typeof spyOn>
@@ -14,11 +29,7 @@ describe("runBunInstallWithDetails", () => {
   beforeEach(() => {
     getOpenCodeCacheDirSpy = spyOn(dataPath, "getOpenCodeCacheDir").mockReturnValue("/tmp/opencode-cache")
     logSpy = spyOn(logger, "log").mockImplementation(() => {})
-    spawnWithWindowsHideSpy = spyOn(spawnHelpers, "spawnWithWindowsHide").mockReturnValue({
-      exited: Promise.resolve(0),
-      exitCode: 0,
-      kill: () => {},
-    } as ReturnType<typeof spawnHelpers.spawnWithWindowsHide>)
+    spawnWithWindowsHideSpy = spyOn(spawnHelpers, "spawnWithWindowsHide").mockReturnValue(createProc(0))
     existsSyncSpy = spyOn(fs, "existsSync").mockReturnValue(true)
   })
 
@@ -29,9 +40,13 @@ describe("runBunInstallWithDetails", () => {
     existsSyncSpy.mockRestore()
   })
 
-  it("runs bun install in the OpenCode cache directory", async () => {
+  it("runs bun install in the OpenCode cache directory with inherited output by default", async () => {
+    // given
+
+    // when
     const result = await runBunInstallWithDetails()
 
+    // then
     expect(result).toEqual({ success: true })
     expect(getOpenCodeCacheDirSpy).toHaveBeenCalledTimes(1)
     expect(spawnWithWindowsHideSpy).toHaveBeenCalledWith(["bun", "install"], {
@@ -40,4 +55,42 @@ describe("runBunInstallWithDetails", () => {
       stderr: "inherit",
     })
   })
+
+  it("pipes install output when requested", async () => {
+    // given
+
+    // when
+    const result = await runBunInstallWithDetails({ outputMode: "pipe" })
+
+    // then
+    expect(result).toEqual({ success: true })
+    expect(spawnWithWindowsHideSpy).toHaveBeenCalledWith(["bun", "install"], {
+      cwd: "/tmp/opencode-cache",
+      stdout: "pipe",
+      stderr: "pipe",
+    })
+  })
+
+  it("logs captured output when piped install fails", async () => {
+    // given
+    spawnWithWindowsHideSpy.mockReturnValue(
+      createProc(1, {
+        stdout: "resolved 10 packages",
+        stderr: "network error",
+      })
+    )
+
+    // when
+    const result = await runBunInstallWithDetails({ outputMode: "pipe" })
+
+    // then
+    expect(result).toEqual({
+      success: false,
+      error: "bun install failed with exit code 1",
+    })
+    expect(logSpy).toHaveBeenCalledWith("[bun-install] Captured output from failed bun install", {
+      stdout: "resolved 10 packages",
+      stderr: "network error",
+    })
+  })
 })