feat(FN-2855): route scheduled tasks using effective node resolution

- Add an effective node resolver with task override, project default, and local fallback precedence.
- Wire scheduler dispatch to persist effectiveNodeId/effectiveNodeSource and log resolved node routing.
- Add coverage for effective node resolution and scheduler node routing integration behavior.
- Stabilize workspace test resolution by adding @fusion/core and @fusion/plugin-sdk aliases across Vitest configs.

packages/cli/vitest.config.ts

@@ -21,6 +21,7 @@ export default defineConfig({
       { find: /^@fusion\/dashboard\/planning$/, replacement: resolve(__dirname, "../dashboard/src/planning.ts") },
       { find: /^@fusion\/dashboard$/, replacement: resolve(__dirname, "../dashboard/src/index.ts") },
       { find: /^@fusion\/engine$/, replacement: resolve(__dirname, "../engine/src/index.ts") },
+      { find: /^@fusion\/plugin-sdk$/, replacement: resolve(__dirname, "../plugin-sdk/src/index.ts") },
       { find: /^@fusion\/test-utils$/, replacement: resolve(__dirname, "../core/src/__test-utils__/workspace.ts") },
     ],
   },