fix: use consistent error formatting across all commands

[Rome-1]

What

Some commands use `fmt.error()` for styled error output, while others use raw `console.error()`. Standardize on `fmt.error()` for consistency.

Why

Consistent error formatting means agents and scripts can reliably parse error output. Mixed formats make automation harder.

How to find them

```bash

Find raw console.error usage in commands (should use fmt instead)

grep -rn 'console.error' node/src/commands/
```

Fix

Replace `console.error(...)` with the project's `fmt.error(...)` utility, matching how other commands handle errors.

Files to check

• `node/src/commands/backend/get.ts`
• All files in `node/src/commands/` that use `console.error`
• Python equivalents should also be checked for consistency