fix(plugin-loader): support installed_plugins.json v1 format for backward compatibility (#288)

The installed_plugins.json file has two versions:
- v1: plugins stored as direct objects
- v2: plugins stored as arrays

Use discriminated union types (InstalledPluginsDatabaseV1/V2) for proper
type narrowing based on version field.

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/features/claude-code-plugin-loader/loader.ts

@@ -14,6 +14,7 @@ import type { AgentFrontmatter } from "../claude-code-agent-loader/types"
 import type { ClaudeCodeMcpConfig, McpServerConfig } from "../claude-code-mcp-loader/types"
 import type {
   InstalledPluginsDatabase,
+  PluginInstallation,
   PluginManifest,
   LoadedPlugin,
   PluginLoadResult,
@@ -134,6 +135,15 @@ function isPluginEnabled(
   return true
 }
 
+function extractPluginEntries(
+  db: InstalledPluginsDatabase
+): Array<[string, PluginInstallation | undefined]> {
+  if (db.version === 1) {
+    return Object.entries(db.plugins).map(([key, installation]) => [key, installation])
+  }
+  return Object.entries(db.plugins).map(([key, installations]) => [key, installations[0]])
+}
+
 export function discoverInstalledPlugins(options?: PluginLoaderOptions): PluginLoadResult {
   const db = loadInstalledPlugins()
   const settings = loadClaudeSettings()
@@ -147,15 +157,14 @@ export function discoverInstalledPlugins(options?: PluginLoaderOptions): PluginL
   const settingsEnabledPlugins = settings?.enabledPlugins
   const overrideEnabledPlugins = options?.enabledPluginsOverride
 
-  for (const [pluginKey, installations] of Object.entries(db.plugins)) {
+  for (const [pluginKey, installation] of extractPluginEntries(db)) {
-    if (!installations || installations.length === 0) continue
+    if (!installation) continue
 
     if (!isPluginEnabled(pluginKey, settingsEnabledPlugins, overrideEnabledPlugins)) {
       log(`Plugin disabled: ${pluginKey}`)
       continue
     }
 
-    const installation = installations[0]
     const { installPath, scope, version } = installation
 
     if (!existsSync(installPath)) {

src/features/claude-code-plugin-loader/types.ts

@@ -20,14 +20,29 @@ export interface PluginInstallation {
   isLocal?: boolean
 }
 
+/**
+ * Installed plugins database v1 (legacy)
+ * plugins stored as direct objects
+ */
+export interface InstalledPluginsDatabaseV1 {
+  version: 1
+  plugins: Record<string, PluginInstallation>
+}
+
+/**
+ * Installed plugins database v2 (current)
+ * plugins stored as arrays
+ */
+export interface InstalledPluginsDatabaseV2 {
+  version: 2
+  plugins: Record<string, PluginInstallation[]>
+}
+
 /**
  * Installed plugins database structure
  * Located at ~/.claude/plugins/installed_plugins.json
  */
-export interface InstalledPluginsDatabase {
+export type InstalledPluginsDatabase = InstalledPluginsDatabaseV1 | InstalledPluginsDatabaseV2
-  version: number
-  plugins: Record<string, PluginInstallation[]>
-}
 
 /**
  * Plugin author information