refactor(cli): remove unused imports and variables

Eliminates no-unused-vars warnings across the CLI package by dropping
dead type imports, unused destructured helpers, and simplifying try/catch
blocks whose caught errors and intermediate results were never read.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/cli/src/commands/node.ts

@@ -1,4 +1,4 @@
-import { CentralCore, type NodeConfig, type SystemMetrics } from "@fusion/core";
+import { CentralCore, type NodeConfig } from "@fusion/core";
 import { createInterface } from "node:readline/promises";
 
 // ── Options Interfaces ───────────────────────────────────────────────────────