Rewrites the hg worker to use json-log?rev=author() which matches the
changeset author (not the pusher), capturing commits landed by sheriffs.
Repos are discovered within configured groups plus individually listed
repos. The worker skips entirely after the first successful backfill.
Adds script/hg-ingest.sh for offline ingestion via local hg clones —
clones one repo at a time, caches extracted changesets to .tsv, inserts
via psql, and sets poller_state when done.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
