fix(ci): align engine/schema test stubs with cli-agent surface

The cli-agent executor feature added engine.getCliAgentRuntime() (called by
the CLI dashboard command at load) and bumped @fusion/core SCHEMA_VERSION
108→110. Update the stale test stubs:

- cli dashboard.test.ts: add getCliAgentRuntime() to the mock FnAgent class
  (returns undefined; runDashboard handles the no-runtime path). Fixes 52
  failures all rooted at `cwdEngine?.getCliAgentRuntime is not a function`.
- roadmap-store.test.ts: the roadmap store layers on core's Database, so its
  schema version tracks core; assert 110 instead of 108.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/cli/src/commands/__tests__/dashboard.test.ts

@@ -495,6 +495,10 @@ vi.mock("@fusion/engine", async (importOriginal) => {
       return { stop: vi.fn() };
     }
 
+    getCliAgentRuntime(): undefined {
+      return undefined;
+    }
+
     async onMerge(taskId: string): Promise<unknown> {
       return aiMergeTask(this.store, this.cwd, taskId, {
         pool: this.pool,