v0.18.1: Equipment Sets — Collect the Full Set, Reap the Bonus

✨ NEW: Equipment Sets

15 named gear sets now grant real bonuses for collecting them:

• Purple (5 sets): Asura / Heaven Demon / Celestial / True Immortal / Golden Immortal — five-piece accessory sets. Full set +4%.
• Orange (5 sets): Supreme / Paramount / Sacred / Undying / Eternal — armor-focused sets. Full set +5%.
• Red (5 sets): Genesis / Extinction / Boundless span all 8 slots (full set +8%); Taiji and Everlasting cover 7/6 slots.
• Bonuses start at just 2 pieces, scaling through mid tiers; each set spreads its bonus across attack/defense/HP by theme (Genesis = attack, Boundless = defense, Everlasting = HP).

The inventory equipment panel now shows a set tracker bar — pieces collected, the active bonus, and a preview of the next tier. The gear comparison modal tags which set an item belongs to. Auto-equip gives a small 5% score nudge toward completing a set you already wear, but a genuinely better standalone piece still wins.

🔧 FIXED: Gathering Quest Dead End

Before: the gathering tutorial taught you to gather materials, but the main quest "The Value of Spirit Stones" only counted a shop purchase — following the tutorial never completed the quest. Now: the quest takes both paths (complete 1 gathering + buy 1 item, either order). Existing saves receive the new objective automatically on load — no action needed.

🧹 Under the Hood

Removed ~2,800 lines of dead legacy code and stabilized two flaky automated-test scenarios. No gameplay impact — just a leaner, more reliable build. No save-format changes this patch.