The roadmap-dashboard Vitest sub-project overrode setupFiles with only
its jsdom helper. Vitest replaces (does not merge) setupFiles in child
projects, so the central isolation guard at
packages/core/src/__test-utils__/vitest-setup.ts was silently bypassed
for the 94 roadmap-dashboard tests, leaving them able to touch the real
project .fusion / $HOME / child processes without the leak-detection
and AI-CLI block.
Prepend the central guard so it loads before the dashboard jsdom setup.
All 94 roadmap-dashboard tests still pass.
Migrate the Fusion dashboard's vitest configuration to use the new `test.projects` API in the roadmap plugin, with plugin view registration updates and typecheck fixes in the dashboard components.
Fusion-Task-Id: FN-3898
Merges the roadmap plugin scaffold (FN-3636): a new `plugins/fusion-plugin-roadmap` workspace with domain types (`roadmap-types.ts`), a store layer (`roadmap-store.ts`, `roadmap-ordering.ts`, `roadmap-handoff.ts`), and comprehensive test suites. Also lands graph position persistence for the dependen
Fusion-Task-Id: FN-3636
