docs: add executive summary and project classification to PRD

bmad/_bmad-output/planning-artifacts/prd.md

@@ -1,5 +1,5 @@
 ---
-stepsCompleted: ['step-01-init', 'step-02-discovery']
+stepsCompleted: ['step-01-init', 'step-02-discovery', 'step-02b-vision', 'step-02c-executive-summary']
 inputDocuments:
   - '_bmad-output/brainstorming/brainstorming-session-2026-04-12-001.md'
 workflowType: 'prd'
@@ -14,3 +14,19 @@ classification:
 
 **Author:** MiTi
 **Date:** 2026-04-12
+
+## Executive Summary
+
+2048 Clone is a faithful web-based recreation of Gabriele Cirulli's 2048 puzzle game, built with Svelte, Tailwind CSS, and Vite. The player slides numbered tiles on a 4x4 grid, merging identical values to reach the 2048 tile. This is a personal exploration project — the goal is to learn modern web tooling while building a complete, polished, playable game that matches the original's mechanics and feel.
+
+### What Makes This Special
+
+This project prioritizes craft over novelty. Rather than adding twists or unique features, the focus is on deeply understanding and faithfully reproducing every detail of the original — the 90/10 tile spawn probability, the leading-edge merge order, the 100ms slide transitions, the satisfying merge bounce. The result is a clean, well-structured Svelte codebase that serves as both a playable game and a learning artifact.
+
+## Project Classification
+
+- **Project Type:** Web application (single-page app)
+- **Domain:** General / entertainment
+- **Complexity:** Low — single-player, no backend, no auth, localStorage only
+- **Project Context:** Greenfield — new project from scratch
+- **Tech Stack:** Svelte + Vanilla JS + Tailwind CSS + Vite + GitHub Pages