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Phase 6 part 2 (partial): - daily_seed_for(date) and PlayerProgress::record_daily_completion in solitaire_data, with streak logic that increments on consecutive days, resets on a skipped day, and is idempotent on same-day re-completions. - DailyChallengePlugin tracks today's seed, awards +100 XP and updates the streak when the player wins a game whose seed matches. Pressing C starts a new game with the daily seed. - LevelUpEvent toast in AnimationPlugin announces level changes. - AchievementContext gains daily_challenge_streak; daily_devotee achievement unlocks at streak >= 7. AchievementPlugin reads ProgressResource and runs after ProgressUpdate. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>