Replaces the scheduled workflow that pushed upstream georelay CSV directly to main unreviewed with a validator-backed automation that resolves an immutable upstream commit, validates against the reviewed baseline, and opens a non-auto-merged PR (or tracking issue) instead of writing to main. Adds a mirrored strict client-side validator in GeoRelayDirectory (all-or-nothing, size/row/host/coord caps, streamed 512KiB cap, >=50% baseline overlap) that fails safe to last-known-good, and retargets runtime refresh to bitchat's reviewed copy.
