Moves roadmap ownership from `@fusion/core` to `fusion-plugin-roadmap`, deleting ~1,800 lines of roadmap store, types, ordering, and handoff logic from core and replacing it with ~760 lines of new route handlers in the plugin. The dashboard's roadmap routes and suggestions modules are substantially
Fusion-Task-Id: FN-3159
The merge extracts the roadmap domain into a standalone plugin package (`plugins/fusion-plugin-roadmap`), wiring it into the CLI bundle and dashboard scaffold, with new modules for roadmap types, store, ordering, and handoff logic. A secondary change normalizes shell host bootstrap, introducing `She
Fusion-Task-Id: FN-3158
