funman300
788ac9f65a
Phase 6 part 4b (partial): - GameMode::Challenge variant in solitaire_core. undo() returns RuleViolation when mode is Challenge so the player commits to each decision. - solitaire_data::challenge defines a stable CHALLENGE_SEEDS list with challenge_seed_for(index) wrapping modulo length. - PlayerProgress.challenge_index (serde-default for older saves) tracks how far the player has progressed. - ChallengePlugin advances the cursor on Challenge-mode wins, persists, and emits ChallengeAdvancedEvent. Pressing X starts a Challenge-mode game with the current seed; gated to level >= CHALLENGE_UNLOCK_LEVEL (5). - InputPlugin's Z key (Zen mode) is now also gated to level >= 5. Time Attack and unlock UI still deferred. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>