fix(auto-updater): handle bun.lockb and add workspace validation

- Support binary bun.lockb format by deleting entire file (cannot parse)
- Add workspace check: verify package.json exists before bun install
- Quote paths in error messages for Windows/paths with spaces

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

@@ -1,4 +1,5 @@
-import { beforeEach, afterEach, describe, expect, it, mock, spyOn } from "bun:test"
+import { beforeEach, afterEach, describe, expect, it, spyOn } from "bun:test"
+import * as fs from "node:fs"
 import * as dataPath from "../../shared/data-path"
 import * as logger from "../../shared/logger"
 import * as spawnHelpers from "../../shared/spawn-with-windows-hide"
@@ -8,6 +9,7 @@ describe("runBunInstallWithDetails", () => {
   let getOpenCodeCacheDirSpy: ReturnType<typeof spyOn>
   let logSpy: ReturnType<typeof spyOn>
   let spawnWithWindowsHideSpy: ReturnType<typeof spyOn>
+  let existsSyncSpy: ReturnType<typeof spyOn>
 
   beforeEach(() => {
     getOpenCodeCacheDirSpy = spyOn(dataPath, "getOpenCodeCacheDir").mockReturnValue("/tmp/opencode-cache")
@@ -15,14 +17,16 @@ describe("runBunInstallWithDetails", () => {
     spawnWithWindowsHideSpy = spyOn(spawnHelpers, "spawnWithWindowsHide").mockReturnValue({
       exited: Promise.resolve(0),
       exitCode: 0,
-      kill: mock(() => {}),
+      kill: () => {},
     } as ReturnType<typeof spawnHelpers.spawnWithWindowsHide>)
+    existsSyncSpy = spyOn(fs, "existsSync").mockReturnValue(true)
   })
 
   afterEach(() => {
     getOpenCodeCacheDirSpy.mockRestore()
     logSpy.mockRestore()
     spawnWithWindowsHideSpy.mockRestore()
+    existsSyncSpy.mockRestore()
   })
 
   it("runs bun install in the OpenCode cache directory", async () => {

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

@@ -1,3 +1,4 @@
+import { existsSync } from "node:fs"
 import { getOpenCodeCacheDir } from "../../shared/data-path"
 import { log } from "../../shared/logger"
 import { spawnWithWindowsHide } from "../../shared/spawn-with-windows-hide"
@@ -18,6 +19,14 @@ export async function runBunInstall(): Promise<boolean> {
 
 export async function runBunInstallWithDetails(): Promise<BunInstallResult> {
   const cacheDir = getOpenCodeCacheDir()
+  const packageJsonPath = `${cacheDir}/package.json`
+
+  if (!existsSync(packageJsonPath)) {
+    return {
+      success: false,
+      error: `Workspace not initialized: ${packageJsonPath} not found. OpenCode should create this on first run.`,
+    }
+  }
 
   try {
     const proc = spawnWithWindowsHide(["bun", "install"], {
@@ -43,7 +52,7 @@ export async function runBunInstallWithDetails(): Promise<BunInstallResult> {
       return {
         success: false,
         timedOut: true,
-        error: `bun install timed out after ${BUN_INSTALL_TIMEOUT_SECONDS} seconds. Try running manually: cd ${cacheDir} && bun i`,
+        error: `bun install timed out after ${BUN_INSTALL_TIMEOUT_SECONDS} seconds. Try running manually: cd "${cacheDir}" && bun i`,
       }
     }
 

src/hooks/auto-update-checker/cache.ts

@@ -16,31 +16,49 @@ function stripTrailingCommas(json: string): string {
   return json.replace(/,(\s*[}\]])/g, "$1")
 }
 
-function removeFromBunLock(packageName: string): boolean {
-  const lockPath = path.join(CACHE_DIR, "bun.lock")
-  if (!fs.existsSync(lockPath)) return false
-
+function removeFromTextBunLock(lockPath: string, packageName: string): boolean {
   try {
     const content = fs.readFileSync(lockPath, "utf-8")
     const lock = JSON.parse(stripTrailingCommas(content)) as BunLockfile
-    let modified = false
 
     if (lock.packages?.[packageName]) {
       delete lock.packages[packageName]
-      modified = true
-    }
-
-    if (modified) {
       fs.writeFileSync(lockPath, JSON.stringify(lock, null, 2))
       log(`[auto-update-checker] Removed from bun.lock: ${packageName}`)
+      return true
     }
-
-    return modified
+    return false
   } catch {
     return false
   }
 }
 
+function deleteBinaryBunLock(lockPath: string): boolean {
+  try {
+    fs.unlinkSync(lockPath)
+    log(`[auto-update-checker] Removed bun.lockb to force re-resolution`)
+    return true
+  } catch {
+    return false
+  }
+}
+
+function removeFromBunLock(packageName: string): boolean {
+  const textLockPath = path.join(CACHE_DIR, "bun.lock")
+  const binaryLockPath = path.join(CACHE_DIR, "bun.lockb")
+
+  if (fs.existsSync(textLockPath)) {
+    return removeFromTextBunLock(textLockPath, packageName)
+  }
+
+  // Binary lockfiles cannot be parsed; deletion forces bun to re-resolve
+  if (fs.existsSync(binaryLockPath)) {
+    return deleteBinaryBunLock(binaryLockPath)
+  }
+
+  return false
+}
+
 export function invalidatePackage(packageName: string = PACKAGE_NAME): boolean {
   try {
     const pkgDirs = [