fix(doctor): prefer config dir for loaded plugin version

Check the OpenCode config install before the legacy cache install so doctor reports the actual loaded plugin version for bun-based installs.

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

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

src/cli/doctor/checks/system-loaded-version.test.ts

@@ -1,8 +1,107 @@
-import { describe, expect, it } from "bun:test"
+import { afterEach, describe, expect, it } from "bun:test"
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs"
+import { tmpdir } from "node:os"
+import { dirname, join } from "node:path"
 
-import { getSuggestedInstallTag } from "./system-loaded-version"
+import { PACKAGE_NAME } from "../constants"
+import { getLoadedPluginVersion, getSuggestedInstallTag } from "./system-loaded-version"
+
+const originalOpencodeConfigDir = process.env.OPENCODE_CONFIG_DIR
+const originalXdgCacheHome = process.env.XDG_CACHE_HOME
+const temporaryDirectories: string[] = []
+
+function createTemporaryDirectory(prefix: string): string {
+  const directory = mkdtempSync(join(tmpdir(), prefix))
+  temporaryDirectories.push(directory)
+  return directory
+}
+
+function writeJson(filePath: string, value: Record<string, string | Record<string, string>>): void {
+  mkdirSync(dirname(filePath), { recursive: true })
+  writeFileSync(filePath, JSON.stringify(value), "utf-8")
+}
+
+afterEach(() => {
+  if (originalOpencodeConfigDir === undefined) {
+    delete process.env.OPENCODE_CONFIG_DIR
+  } else {
+    process.env.OPENCODE_CONFIG_DIR = originalOpencodeConfigDir
+  }
+
+  if (originalXdgCacheHome === undefined) {
+    delete process.env.XDG_CACHE_HOME
+  } else {
+    process.env.XDG_CACHE_HOME = originalXdgCacheHome
+  }
+
+  for (const directory of temporaryDirectories.splice(0)) {
+    rmSync(directory, { recursive: true, force: true })
+  }
+})
 
 describe("system loaded version", () => {
+  describe("getLoadedPluginVersion", () => {
+    it("prefers the config directory when both installs exist", () => {
+      //#given
+      const configDir = createTemporaryDirectory("omo-config-")
+      const cacheHome = createTemporaryDirectory("omo-cache-")
+      const cacheDir = join(cacheHome, "opencode")
+
+      process.env.OPENCODE_CONFIG_DIR = configDir
+      process.env.XDG_CACHE_HOME = cacheHome
+
+      writeJson(join(configDir, "package.json"), {
+        dependencies: { [PACKAGE_NAME]: "1.2.3" },
+      })
+      writeJson(join(configDir, "node_modules", PACKAGE_NAME, "package.json"), {
+        version: "1.2.3",
+      })
+      writeJson(join(cacheDir, "package.json"), {
+        dependencies: { [PACKAGE_NAME]: "9.9.9" },
+      })
+      writeJson(join(cacheDir, "node_modules", PACKAGE_NAME, "package.json"), {
+        version: "9.9.9",
+      })
+
+      //#when
+      const loadedVersion = getLoadedPluginVersion()
+
+      //#then
+      expect(loadedVersion.cacheDir).toBe(configDir)
+      expect(loadedVersion.cachePackagePath).toBe(join(configDir, "package.json"))
+      expect(loadedVersion.installedPackagePath).toBe(join(configDir, "node_modules", PACKAGE_NAME, "package.json"))
+      expect(loadedVersion.expectedVersion).toBe("1.2.3")
+      expect(loadedVersion.loadedVersion).toBe("1.2.3")
+    })
+
+    it("falls back to the cache directory for legacy installs", () => {
+      //#given
+      const configDir = createTemporaryDirectory("omo-config-")
+      const cacheHome = createTemporaryDirectory("omo-cache-")
+      const cacheDir = join(cacheHome, "opencode")
+
+      process.env.OPENCODE_CONFIG_DIR = configDir
+      process.env.XDG_CACHE_HOME = cacheHome
+
+      writeJson(join(cacheDir, "package.json"), {
+        dependencies: { [PACKAGE_NAME]: "2.3.4" },
+      })
+      writeJson(join(cacheDir, "node_modules", PACKAGE_NAME, "package.json"), {
+        version: "2.3.4",
+      })
+
+      //#when
+      const loadedVersion = getLoadedPluginVersion()
+
+      //#then
+      expect(loadedVersion.cacheDir).toBe(cacheDir)
+      expect(loadedVersion.cachePackagePath).toBe(join(cacheDir, "package.json"))
+      expect(loadedVersion.installedPackagePath).toBe(join(cacheDir, "node_modules", PACKAGE_NAME, "package.json"))
+      expect(loadedVersion.expectedVersion).toBe("2.3.4")
+      expect(loadedVersion.loadedVersion).toBe("2.3.4")
+    })
+  })
+
   describe("getSuggestedInstallTag", () => {
     it("returns prerelease channel when current version is prerelease", () => {
       //#given