Align Workspace DNA with Genesis Living Systems positioning (#10)

Major content refresh: 162 insertions across 7 enhancement areas.

- Workspace DNA messaging: Living Systems with Memory/Intelligence/Execution layers (aligns with landing#5145)
- Genesis Community Gallery with 12 real community apps + YouTube tutorial playlist (11 videos)
- Genesis capabilities: Stripe, mobile, EVE, multi-model, MCP v2, custom domains, app cloning, analytics
- New tools: FastMCP, Claude Agent SDK, Mastra, Gumloop
- New section: AI Browser Agents (browser-use, Bardeen, Skyvern, Multion)
- New subsections: MCP Design Principles, Harness Engineering, Spec-Driven Development, The Middle Loop
- Stats: Cursor 2B ARR, MIT Technology Review 2026 citation, 260+ tools

Author: johnxie