- Removed `examples/plugin/main.go` and `internal/pluginhost/loader_plugin.go` after migrating to a more modular system. - Introduced `streamBridge` in `internal/pluginhost/stream_bridge.go` for efficient stream handling and communication. - Added examples of `thinking` plugins written in both Rust and Go under `examples/plugin/thinking`. - Enhanced test coverage for plugin host system changes, including stream chunk translation and thinking logic. - Improved API compatibility and ensured backward-compatible upgrades for plugin execution.