* fix(plugins): import adopted catalog history into the OpenClaw transcript
Import native Pi and OpenCode history when a catalog session is adopted so the OpenClaw transcript reflects the full conversation immediately.
Mark imported user rows with mirrorOrigin because they are transcript mirrors, not new external turns. This preserves watcher deduplication and prevents adopted history from being reported as fresh upstream input.
* refactor(plugins): split catalog history importer
Keep the session catalog contract module leaf-like by moving transcript mutation into a dedicated runtime module. This breaks the registry-to-transcript import cycle while preserving the Plugin SDK entrypoint and importer behavior.
