Custom skin: ~/.hermes/skins/trismegistus.yaml
- Emerald Tablet color palette (sea green, emerald, gold)
- Alchemical spinner: transmuting, divining, consulting the tablet
- Mercury symbol (☿) throughout — prompt, response labels, wings
- Banner hero with AS ABOVE / SO BELOW motif
- Welcome: 'As above, so below. What needs doing?'
- Goodbye: 'The work continues. ☿'
