fix: locate codex plugin from platform binary

src/cli/install-codex/install-codex.test.ts

@@ -5,7 +5,7 @@ import { describe, expect, test } from "bun:test"
 import { mkdir, mkdtemp, readdir, readFile, readlink, rm, stat, writeFile } from "node:fs/promises"
 import { tmpdir } from "node:os"
 import { join } from "node:path"
-import { resolveCodexInstallerBinDir, runCodexInstaller } from "./install-codex"
+import { findRepoRootFromImporter, resolveCodexInstallerBinDir, runCodexInstaller } from "./install-codex"
 
 const EXPECTED_OMO_COMPONENT_BINS = [
   { name: "omo", target: join("components", "ulw-loop", "dist", "cli.js") },
@@ -26,6 +26,22 @@ const STALE_CODEX_COMPONENT_BINS = [
 ] as const
 
 describe("install-codex", () => {
+  test("#given npm platform binary package #when resolving vendored repo root #then finds sibling wrapper package", async () => {
+    // given
+    const nodeModules = await mkdtemp(join(tmpdir(), "omo-codex-node-modules-"))
+    const importerDir = join(nodeModules, "oh-my-openagent-darwin-arm64", "bin")
+    const wrapperRoot = join(nodeModules, "oh-my-openagent")
+    await mkdir(join(importerDir), { recursive: true })
+    await mkdir(join(wrapperRoot, "packages", "omo-codex", "plugin", ".codex-plugin"), { recursive: true })
+    await writeFile(join(wrapperRoot, "packages", "omo-codex", "plugin", ".codex-plugin", "plugin.json"), "{}")
+
+    // when
+    const repoRoot = findRepoRootFromImporter(importerDir)
+
+    // then
+    expect(repoRoot).toBe(wrapperRoot)
+  })
+
   test("#given default CODEX_HOME #when resolving installer bin dir without override #then preserves user local bin precedence", () => {
     // given
     const homeDir = join(tmpdir(), "omo-codex-home-default")

src/cli/install-codex/install-codex.ts

@@ -196,15 +196,19 @@ function codexMarketplaceSource(marketplaceRoot: string): CodexMarketplaceSource
   return { sourceType: "local", source: marketplaceRoot }
 }
 
-function findRepoRootFromImporter(importerDir: string): string {
+export function findRepoRootFromImporter(importerDir: string): string {
   let current = importerDir
   for (let depth = 0; depth <= 5; depth += 1) {
     const pluginManifestPath = join(current, "packages", "omo-codex", "plugin", ".codex-plugin", "plugin.json")
     if (existsSyncLike(pluginManifestPath)) return current
+    for (const wrapperPackageRoot of [join(current, "node_modules", "oh-my-openagent"), join(current, "oh-my-openagent")]) {
+      const wrapperPluginManifestPath = join(wrapperPackageRoot, "packages", "omo-codex", "plugin", ".codex-plugin", "plugin.json")
+      if (existsSyncLike(wrapperPluginManifestPath)) return wrapperPackageRoot
+    }
     current = resolve(current, "..")
   }
   throw new Error(
-    "Unable to locate vendored Codex plugin: expected packages/omo-codex/plugin/.codex-plugin/plugin.json within 5 parent levels",
+    "Unable to locate vendored Codex plugin: expected packages/omo-codex/plugin/.codex-plugin/plugin.json in this package or sibling oh-my-openagent package within 5 parent levels",
   )
 }