Historical pack 2022-v1 — derived data attribution

Participation: NFL NextGenStats via nflverse, 2022 season.
https://nflreadr.nflverse.com/reference/load_participation.html
License: Creative Commons Attribution-ShareAlike 4.0 International.
https://creativecommons.org/licenses/by-sa/4.0/

Play-by-play, weekly rosters and player statistics: nflverse contributors.
https://github.com/nflverse/nflverse-data
Repository license: Creative Commons Attribution 4.0 International.
https://github.com/nflverse/nflverse-data/blob/main/LICENSE.md

The derived historical-2022.json and personnel-2022.json data and their JavaScript wrappers
are distributed under CC BY-SA 4.0. Retain attribution and indicate changes
when sharing adaptations. This notice applies to the historical data pack,
not the site's separately authored code or brand artwork.

Changes: filtered regular-season late-game snapshots; joined participation
to play-by-play by game/play ID, and to weekly rosters by GSIS ID/team/week;
aggregated player stats and recorded run/pass participation before the
scenario's week. Skill positions assigned to schematic slots. Source
locations, retrieval date and SHA-256 hashes are embedded in the pack.

No endorsement by the NFL, its teams, nflverse or individual players is
implied. No player photos, team logos, proprietary grades, missed-tackle
rates or coverage ratings are included. The field is a schematic layout;
the opening snapshot supplies the default lineup. User-selected skill-player
substitutions are simulated. The personnel supplement joins offensive participants
from the same game to exact-week rosters and strictly pre-game statistics; it does
not establish a player's availability at the selected moment or ability rating.