Merging the playground performance pass after rebasing it onto current main and re-running a fresh local production build. The branch stays scoped to HermesWorld performance and asset-weight reductions.
- Add 8 Greek god PNG avatars: athena, apollo, artemis, iris, nike, eros, pan, chronos - Refactor PNG renderer into makeGreekPNG factory (one fn per god) - AvatarPicker now has two tiers: * Standard tier: 9 emoji-styled SVG avatars (smaller tiles, default view) * Greek tier: 9 anime PNG portraits (premium, opens via 'More ->' button) - Picker remembers tier based on currently selected avatar - Greek tile shows actual PNG thumb at 56x56, emoji tile shows 2xl emoji - 'More ->' / '<- Standard' toggle button switches tiers in-place - Default avatar remains 'hermes' (god of messengers, fits the brand)
