docs: add 2048 game brainstorming session with first principles research

bmad/_bmad-output/brainstorming/brainstorming-session-2026-04-12-001.md

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+---
+stepsCompleted: [1, 2]
+inputDocuments: []
+session_topic: 'Classic 2048 web game recreation'
+session_goals: 'Faithful recreation of original 2048 gameplay with local scoring, built as exploration project'
+selected_approach: 'user-selected'
+techniques_used: ['First Principles Thinking', 'Mind Mapping', 'Morphological Analysis']
+ideas_generated: []
+context_file: ''
+---
+
+# Brainstorming Session Results
+
+**Facilitator:** MiTi
+**Date:** 2026-04-12
+
+## Session Overview
+
+**Topic:** Classic 2048 web game recreation
+**Goals:** Faithful recreation of original 2048 gameplay with local scoring, built as an exploration/learning project. No monetization, no leaderboard, no unique twists.
+
+### Session Setup
+
+- User wants a straightforward classic 2048 clone
+- Focus on solid gameplay mechanics, clean UI, and local score tracking
+- This is an exploration project — learning and having fun building it
+
+## Technique Selection
+
+**Approach:** User-Selected Techniques (with AI recommendation)
+**Selected Techniques:**
+
+- First Principles Thinking: Strip 2048 down to fundamental mechanics
+- Mind Mapping: Branch out all game components for completeness
+- Morphological Analysis: Systematically explore tech stack and architecture decisions
+
+**Selection Rationale:** Practical, implementation-focused techniques suited to a well-defined recreation project