Reframe the integration approach: klondike is a read-only dependency;
all 8 gaps (scoring, game modes, solver, take_from_foundation, serde,
MoveError, waste pile, undo stack) are closed in solitaire_core via a
KlondikeAdapter wrapper layer. No upstream changes to card_game or
klondike are required.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Documents what Quaternions/card_game already provides, what
solitaire_core requires that is currently missing, and the
suggested step-by-step integration path.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>