During rig initialization, now creates a .beads-ephemeral/ directory:
- Initialized as a git repo (for local versioning)
- Contains config.yaml with ephemeral: true
- Automatically added to rig .gitignore
This provides a local-only beads database for runtime tracking of
wisps and molecules, separate from the synced .beads/ database.
Closes gt-3x0z.1
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>