Replace the bespoke WXP scoring engine with the upstream
card_game/klondike session stats, eliminating duplicated state that
could drift from the single source of truth.
score()/undo_count()/recycle_count() now read session.stats(); the -15
undo penalty is configured as SessionConfig::undo_penalty and applied by
the upstream score formula. Save schema bumped v4 -> v5 (the three
counters are no longer persisted -- they are rebuilt by replaying the
forward instruction history on load).
- Remove GameState fields score, undo_count, recycle_count (#87)
- Remove score_history / is_recycle_history undo journal (#86)
- Remove KlondikeAdapter::apply_undo_score and the score_for_* helpers,
plus pre_instruction_score_delta / will_flip_tableau_source (#84)
These three issues are a single atomic change: each removed field/helper
is consumed by the same draw/apply_instruction/undo/serde/PartialEq
paths, so they cannot compile or pass tests in isolation.
Behaviour changes (intentional): the escalating recycle penalty and
per-step score floor are gone (upstream linear scoring, floored once at
0); recycle_count is now cumulative; undo_count resets across save/load.
Refs #84, #86, #87
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
funman300
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