feat(cli): add /verbose slash command to toggle debug output at runtime

[cesareth]

Closes #77.

What this adds

A /verbose slash command that toggles verbose mode on and off without restarting the CLI.

Behaviour

State	What you see
ON	Full tool call parameters, results, and DEBUG logs
OFF	Normal kawaii spinner display (default)

How it works

• Toggles self.verbose on HermesCLI
• Updates the live agent's verbose_logging and quiet_mode flags in real-time
• Reconfigures Python logging levels to match the new state
• Status is reflected in /config output (existing Verbose: line)
• /help lists the command automatically via the shared COMMANDS dict

Changes

• hermes_cli/commands.py — added /verbose entry to COMMANDS
• cli.py — added /verbose dispatch in process_command() + _toggle_verbose() method

Testing

$ hermes
> /verbose
Verbose mode ON — tool calls, parameters, and results will be shown.
> /verbose
Verbose mode OFF — returning to normal display.
> /config
  Verbose:    False

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