docs: remove legacy package name from public docs

Author: ndycode

README.md

@@ -133,7 +133,7 @@ This release intentionally breaks the old package line and moves the runtime to
 
 - Rename the GitHub repository to `ndycode/oc-codex-multi-auth`
 - Publish `oc-codex-multi-auth@6.0.0`
-- Deprecate `oc-chatgpt-multi-auth` on npm with a pointer to the new package
+- Deprecate the legacy npm package with a pointer to the new package
 - Verify docs, badges, repo links, and OpenCode config examples all resolve to `oc-codex-multi-auth`
 - rerun `opencode auth login`
 - inspect `~/.opencode/logs/codex-plugin/` after running one request with `ENABLE_PLUGIN_REQUEST_LOGGING=1`

docs/faq.md

@@ -41,4 +41,4 @@ Start with [Troubleshooting](troubleshooting.md), rerun `opencode auth login`, a
 
 ## I used the old package name. What changed?
 
-The package was renamed from `opencode-openai-codex-auth-multi` to `oc-chatgpt-multi-auth`, and now from `oc-chatgpt-multi-auth` to `oc-codex-multi-auth`. If you still reference either older name in your OpenCode config, replace it with `oc-codex-multi-auth`.
+This package has gone through earlier naming changes. If you still reference any older package name in your OpenCode config, replace it with `oc-codex-multi-auth`.

docs/troubleshooting.md

@@ -47,7 +47,7 @@ if (plugin.includes("opencode-openai-codex-auth") || plugin.includes("opencode-c
 
 **Resolution:**
 
-The package was renamed from `opencode-openai-codex-auth-multi` to `oc-chatgpt-multi-auth`, and now to `oc-codex-multi-auth`, which remains the supported package line.
+This package previously shipped under older names. `oc-codex-multi-auth` is the supported package line.
 
 **If you were using the old package:**