Adds GitHub tracking fields to the task model with schema migration, store accessors, and type definitions in `@fusion/core`. New `github-tracking.ts` module exposes a resolver for fetching GitHub issue/PR metadata, integrated into the task store. Test coverage spans the new module, store integratio
Fusion-Task-Id: FN-3869
Adds a local runtime manager to the desktop app (FN-3404) — an embedded engine process managed via IPC with packaging for bundled dependencies and lifecycle documentation. Also includes project mapping onboarding UI with persistence and rollback (FN-3505), plus related dashboard API and hook updates
Fusion-Task-Id: FN-3404