- Hoist APP_DIR_NAME = "ferrous_solitaire" to solitaire_data crate root
as pub(crate); remove 5 duplicate local definitions across achievements,
progress, settings, storage, replay modules (L-9)
- Add #[must_use] to can_place_on_foundation, can_place_on_tableau, and
is_valid_tableau_sequence in solitaire_core::rules so callers that
accidentally discard the result get a compile-time warning (L-6)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
67271266e1