0.4.5

Makes upgraded nodes re-deliver listings whose wire representation changed, so the 0.4.4 gallery/layout thumbnails reach partners immediately instead of waiting for each listing's next edit.

• New rule for data migrations: when an upgrade changes what a listing serves on the wire, the migration stamps federation_updated_at for the affected listings — that column is the wire updated_at and the sync cursor (API-4), so partners re-sync exactly the listings that changed.
• Applied retroactively to the thumbnail change: on update, every listing with gallery or layout media is stamped — including on nodes that already took the 0.4.4 migration before this rule existed.
• Expect one burst of updates on partner nodes after upgrading; subsequent syncs return to normal incremental behavior.