Codex Plus reports 0.1.0-preview.8

Adds native multi-environment selection keyed by canonical CODEX_HOME, with shared path precedence and a read-only codex-plus-context diagnostic.

Existing explicit state/config paths remain supported. No home migration, authentication copying or native daemon restart is performed. Notification relay/hook activation remains opt-in.

Source: c73c237

SHA-256: 1b71b17bb713b6350cfcf376ea2a023ce0d778e75ed815fb4b0d6bc34b9919a3