codex-plugin-cc v1.0.6 - public npm page polish

This release removes stale pre-publish wording from the README rendered on
npmjs after the package went live.

Install

npm install -g codex-plugin-cc
codex-claude-review enable
codex-claude-review doctor

Public npm is now presented as the canonical install lane.
Source install is documented as the local plugin development path.
Version metadata is aligned across package.json, package-lock.json, and
.codex-plugin/plugin.json.