Aethera beginner campaign kit

GM: Start with Your-First-Aethera-Campaign.pdf. It contains adventure spoilers.
Keep the maps, assets, and starter-content folders with the Markdown guide.
The three maps use 64px square cells (24 x 16 cells), at 5 feet per cell in the guide.
Import each journal JSON once. Verify the GM notes are private from a player account.
Share only PLAYER-HANDOUT.md and PLAYER-QUICKSTART.md with players.
VIDEO-SCRIPT.md is production material, not a finished video.
VERIFICATION.md records rehearsal results and their limits.
