feat(FN-1667): merge fusion/fn-1667 (auto-resolved)

- test(FN-1667): complete Step 4 — verify roadmap model
- feat(FN-1667): complete Step 3 — document roadmap model
- feat(FN-1667): complete Step 2 — add roadmap ordering helpers
- feat(FN-1667): complete Step 1 — define roadmap contracts

.fusion/memory.md

@@ -236,7 +236,7 @@ Dashboard SSE (`/api/events`) streams plugin lifecycle events as normalized `plu
 - In executor worktrees, task attachment files referenced in PROMPT may exist only under the main repo path (`/Users/.../Projects/kb/.fusion/tasks/...`); if relative `.fusion/tasks/...` paths are missing, read the absolute attachment path directly.
 - SQLite `ORDER BY timestamp DESC` alone can be nondeterministic when multiple rows share the same millisecond timestamp; add a stable tiebreaker (for example `rowid DESC`) when selecting a "latest" event.
 - In `TaskCard.tsx`, `isInteractiveTarget` must check `target instanceof Element` (not `HTMLElement`) so SVG elements from lucide-react icons are correctly detected as interactive when inside buttons.
-- If root `pnpm test` fails in `@gsxdsm/fusion` with `No matching export ... exportAgentsToDirectory` from `@fusion/core/dist/index.js`, run `pnpm --filter @fusion/core build` before rerunning tests so the core dist exports are refreshed for Bun compile tests.
+- If workspace tests fail resolving `@fusion/core` package exports from `packages/core/dist/index.js` (for example `No matching export ...` in CLI/TUI/package-level tests after adding a new core export), run `pnpm --filter @fusion/core build` before rerunning the suite so ignored `dist/` exports are refreshed.
 - QuickEntryBox control test IDs are reused in `ListView` integration tests; when control layout changes (for example nested menu → inline buttons), update both `QuickEntryBox.test.tsx` and `ListView.test.tsx` together to avoid cascading failures.
 - When `InlineCreateCard` layout changes, also check `Column.test.tsx` and `board-mobile.test.tsx` for references to moved/removed test IDs like `inline-create-description-actions`.
 - When adding portal-based dropdown menus to QuickEntryBox, tests may fail in isolation but pass when run together (test isolation issues). This is because tests share DOM state across describe blocks. Always verify new dropdown tests pass both in isolation (`--testNamePattern`) and when run together.