[mmalkhatib]

Stacked on #64; review that first.

Three small provider-neutral helpers over IQueryable<T>, for list endpoints where the caller chooses what to read. They take already-resolved expressions and know nothing about requests, JSON or permissions.

• RowProjection.Of<T>(columns) / RowProjection.Many<T,TChild>(...): a Select to object[] rows, including nested collection columns (ordered, capped). PostgreSQL reads only the chosen columns, including inside a collection. The shape depends on which columns are chosen, not on values, so each choice compiles once.
• AfterKeyset / OrderByKeyset: keyset paging. (k1 > v1) OR (k1 = v1 AND k2 > v2) …, with < for descending keys. Positions are parameters; strings compare through string.Compare and enums through their underlying type. Nullable keys are refused, since NULL comparisons would drop rows. End the keys with a unique column.
• ToPageAsync(size): a page plus hasMore from one query that reads one extra row. CountUpToAsync(limit): count(*) over LIMIT limit+1, for '10,000+'.

Tests (PostgreSQL 17, Testcontainers), 10 new, 27/27 in the project:

• the SELECT list holds only the chosen columns;
• collection columns are ordered and capped;
• the same columns compile once across new expression trees;
• keyset paging over four orderings (unique key, duplicate status, descending money, string + date + id) visits every row exactly once, in order, with no new compilation per position;
• nullable keys are refused;
• hasMore and capped counts are right at the boundaries.

Unit tests still pass, 24/24.

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