refactor(shared): consolidate plugin entry migration and detection utilities

src/shared/migrate-legacy-plugin-entry.ts

@@ -1,30 +1,16 @@
 import { closeSync, existsSync, fsyncSync, openSync, readFileSync, renameSync, writeFileSync } from "node:fs"
+
 import { applyEdits, modify } from "jsonc-parser"
 
 import { parseJsoncSafe } from "./jsonc-parser"
 import { log } from "./logger"
 import { LEGACY_PLUGIN_NAME, PLUGIN_NAME } from "./plugin-identity"
+import { isCanonicalEntry, isLegacyEntry, toCanonicalEntry } from "./plugin-entry-migrator"
 
 interface OpenCodeConfig {
   plugin?: string[]
 }
 
-function isLegacyEntry(entry: string): boolean {
-  return entry === LEGACY_PLUGIN_NAME || entry.startsWith(`${LEGACY_PLUGIN_NAME}@`)
-}
-
-function isCanonicalEntry(entry: string): boolean {
-  return entry === PLUGIN_NAME || entry.startsWith(`${PLUGIN_NAME}@`)
-}
-
-function toCanonicalEntry(entry: string): string {
-  if (entry === LEGACY_PLUGIN_NAME) return PLUGIN_NAME
-  if (entry.startsWith(`${LEGACY_PLUGIN_NAME}@`)) {
-    return `${PLUGIN_NAME}${entry.slice(LEGACY_PLUGIN_NAME.length)}`
-  }
-  return entry
-}
-
 function normalizePluginEntries(entries: string[]): string[] {
   const hasCanonical = entries.some(isCanonicalEntry)
 
@@ -74,6 +60,7 @@ export function migrateLegacyPluginEntry(configPath: string): boolean {
     } finally {
       closeSync(tempFileDescriptor)
     }
+
     renameSync(tempPath, configPath)
     log("[migrateLegacyPluginEntry] Auto-migrated opencode.json plugin entry", {
       configPath,