Class SnapshotBuilder

Captures the current state of records into VersionLabelItem entries, linking each record to its most recent RecordChange snapshot.

Batched approach

When capturing a dependency graph, the builder:

1. Groups all nodes by EntityID
2. For each entity group, runs ONE batched query to find the latest RecordChange for all records in the group
3. Creates synthetic snapshots for records with no change history
4. Creates VersionLabelItem entries for all records

This reduces hundreds/thousands of individual RunView calls down to a handful of batched queries (one per unique entity type).