Resync docs/v1 snapshot to current truth

Promote the drift that the Amazon dataset PR (#16) held back to stay scoped:
BI-CommonGovernment's authoritative sources.json description, fresher
Open Food Facts (4,466,927 -> 4,517,492 rows) and OSM Germany Relations
(889,712 -> 890,059) local builds with their sizes and row-group counts, and
recorded row-group / vortex metadata for Spambase and uci-iris. Verified
against the on-disk parquet/vortex.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: mprammer <martin@spiraldb.com>

Author: mprammer