tolelom 5ff82120ff docs: add Phase 3 retention systems implementation plan
9 tasks: daily challenge seed/store, unlock system, player titles,
codex system+UI, hard mode/mutations, integration, verification.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-25 15:53:56 +09:00
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