Adds a new `bd mol progress` command that shows molecule progress using
indexed queries instead of loading all steps into memory. This makes it
suitable for mega-molecules with millions of steps.
Features:
- Efficient SQL-based counting via idx_dependencies_depends_on_type index
- Progress display: completed / total (percentage)
- Current step identification
- Rate calculation from closure timestamps
- ETA estimation
- JSON output support
New storage interface method: GetMoleculeProgress(ctx, moleculeID)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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