Obfuscated Passwords

Passwords are currently parameters directly on the command. They should be obfuscated as an interactive prompt after the command is entered.

Instead of:

```
🟢 🔐 > open test.wallet password
Opened wallet: test.wallet
```

It should be something like:

```
🟢 🔐 > open test.wallet
Enter password to unlock: ********
Opened wallet: test.wallet
```

Start by locating the CLI entry point for the open command and how it currently receives the password parameter. Replace the visible password argument with an interactive hidden prompt, preserving the wallet-opening flow; done means the example no longer requires the password on the command line and displays masked input.

Written by the indexing model from the issue text.