docs: add fun & engagement overhaul spec and Phase 0 implementation plan

Six-category brainstorm (first-5min hook, mid-game stagnation, long-term
meta, social loops, ad-friendly monetization, polish/SFX) consolidated into
a master spec; Phase 0 hotfix decomposed into 8 implementer-ready tasks
(haptic, SFX, legendary shake, lucky fusion, combo meter, discovery hero,
welcome gift, ad slot).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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2026-05-02 07:33:42 +09:00
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