Standardize terminology for ephemeral molecule storage:
- .beads-ephemeral/ → .beads-wisps/
- --ephemeral flag → --wisp flag
- All Ephemeral* functions → Wisp*
Wisps are the "steam" in Gas Town's engine metaphor - ephemeral
molecules that evaporate after squash.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>