Add `GameState::take_from_foundation` flag (default false). When off,
Foundation→Tableau moves are blocked at the core rule layer. When on,
the top card of a foundation pile may be moved back to a compatible
tableau column (one card at a time).
Wire the matching `Settings::take_from_foundation` field through
`handle_new_game` so the player's preference applies to every new deal.
Four targeted tests cover: blocked-by-default, allowed-when-enabled,
illegal-tableau-placement, and count>1 rejection.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
af5ac68947