feat: relationship through#212

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ken-kost wants to merge 3 commits intoash-project:mainfrom

ken-kost:feat/relationship-through

Commits on Feb 5, 2026

Generalize lateral join bindings to support N-hop through paths
ken-kost
committed
Resolve list-based through paths in join building and prefix selection
ken-kost
committed
Expand through paths when grouping aggregates by relationship
ken-kost
committed