Each themed skin (ares, poseidon, sisyphus, charizard) now has custom
banner_hero art that replaces the default Hermes caduceus. The hero art
uses braille-dot patterns themed to each skin:
- Ares: shield/spear emblem in crimson/bronze
- Poseidon: trident with wave patterns in blue/seafoam
- Sisyphus: boulder on slope in grayscale
- Charizard: dragon silhouette in orange/ember
Also fixes triple-quote string termination that caused a syntax error
in the previous commit.