- add a reusable registry-source workflow so every source runs in parallel rather than as
a hand-written job; adding a registry becomes one matrix entry plus one script
- add build_registry.py to align the per-source CSVs on the union of columns and emit a
single table discriminated by the source column
- reindex each frame to the union before concatenating, so a source missing a column
yields an empty cell rather than a shifted row
Generated-by: Claude Opus 5 <noreply@anthropic.com>
