Add .beads-ephemeral/ storage support for ephemeral molecule tracking:
- FindEphemeralDir: locate ephemeral directory (sibling to .beads/)
- FindEphemeralDatabasePath: get DB path, create directory if needed
- NewEphemeralStorage: open ephemeral SQLite database
- EnsureEphemeralGitignore: add .beads-ephemeral/ to .gitignore
- IsEphemeralDatabase: check if a path is ephemeral storage
Part of the wisp storage epic for Gas Town patrol cycles.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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