fix(release): revert package identity to oh-my-opencode

Keep installer, config detection, schema generation, and publish workflows aligned with the long-lived oh-my-opencode package so this release does not split across two npm names.

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

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

src/cli/config-manager/plugin-name-with-version.ts

@@ -1,7 +1,6 @@
 import { fetchNpmDistTags } from "./npm-dist-tags"
 
 const DEFAULT_PACKAGE_NAME = "oh-my-opencode"
-const NEW_PACKAGE_NAME = "oh-my-openagent"
 const PRIORITIZED_TAGS = ["latest", "beta", "next"] as const
 
 function getFallbackEntry(version: string, packageName: string): string {
@@ -17,7 +16,7 @@ export async function getPluginNameWithVersion(
   currentVersion: string,
   packageName: string = DEFAULT_PACKAGE_NAME
 ): Promise<string> {
-  const distTags = await fetchNpmDistTags(NEW_PACKAGE_NAME)
+  const distTags = await fetchNpmDistTags(packageName)
 
 
   if (distTags) {