New GameState::winning_line(moves_budget, states_budget) returns the
complete instruction sequence to a win (Ok(None) when unwinnable or
already won, Err on budget exhaustion), compacting the raw DFS trace
with the previously unused card_game Solution::clean_solution and
stripping foundation→foundation no-ops when the stripped line still
replays to a win — an internal replay check guarantees the returned
sequence always applies cleanly via apply_instruction.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
funman300
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