release.py was 2,804 lines, 2,076 of them the frozen legacy author dict.
The map and its resolver now live in scripts/releases/: authors.py holds
the directory loader, the merged AUTHOR_MAP and resolve_author, and
authors_legacy.py holds only the frozen LEGACY_AUTHOR_MAP literal (same
1,895 entries, same order). release.py drops to 707 lines.
The contributor-check job and audit_pr_attribution.py grep the legacy
file for quoted emails, so both now read authors_legacy.py. The
importers (contributor_audit.py, add_contributor.py), contributors/README
and the tests read the defining modules. No behaviour change.
e78e3a77be