fix(shared): add additive opencode config directory discovery

src/shared/opencode-config-dir.ts

@@ -55,16 +55,37 @@ function resolveConfigPath(pathValue: string): string {
   }
 }
 
-function getCliConfigDir(): string {
-  const envConfigDir = process.env.OPENCODE_CONFIG_DIR?.trim()
-  if (envConfigDir) {
-    return resolveConfigPath(envConfigDir)
-  }
-
+function getCliDefaultConfigDir(): string {
   const xdgConfig = process.env.XDG_CONFIG_HOME || join(homedir(), ".config")
   return resolveConfigPath(join(xdgConfig, "opencode"))
 }
 
+function getCliCustomConfigDir(): string | null {
+  const envConfigDir = process.env.OPENCODE_CONFIG_DIR?.trim()
+  if (!envConfigDir) {
+    return null
+  }
+
+  return resolveConfigPath(envConfigDir)
+}
+
+function getCliConfigDir(): string {
+  return getCliCustomConfigDir() ?? getCliDefaultConfigDir()
+}
+
+export function getOpenCodeConfigDirs(options: OpenCodeConfigDirOptions): string[] {
+  if (options.binary !== "opencode") {
+    return [getOpenCodeConfigDir(options)]
+  }
+
+  return Array.from(
+    new Set([
+      ...(getCliCustomConfigDir() ? [getCliCustomConfigDir()!] : []),
+      getCliDefaultConfigDir(),
+    ]),
+  )
+}
+
 export function getOpenCodeConfigDir(options: OpenCodeConfigDirOptions): string {
   const { binary, version, checkExisting = true } = options