feat(wiki): ingest nexus-spatial-discovery — 8-agent product discovery exercise

Ingest raw/Agent/agency-agents/examples/nexus-spatial-discovery.md
Source: 8 The Agency agents parallel discovery exercise for Nexus Spatial
Products: AI spatial command center (SpatialAIOps category)
Key findings: 2D-first/WebXR strategy, debugging as killer use case

Entities created: Nexus-Spatial, CrewAI
Concepts created: SpatialAIOps, Command-Theater-Interface,
  Debugging-Visualization, Semantic-Zoom, Growth-Loop

wiki/entities/CrewAI.md

@@ -0,0 +1,29 @@
+---
+title: "CrewAI"
+type: entity
+tags: [ai-agents, multi-agent, orchestration, open-source]
+last_updated: 2026-04-26
+---
+
+## Overview
+
+开源多 Agent 编排框架，100,000+ 开发者使用，以快速执行著称。
+
+## Key Characteristics
+
+- **CLI-first**：命令行优先，最小化可视化工具
+- **Rapid execution**：以速度为核心竞争优势
+- **Role-based agents**：基于角色的 Agent 设计（CEO/Manager/Worker 等）
+- **Task delegation**：任务委派和结果聚合
+
+## Competitive Position
+
+在 [[nexus-spatial-discovery]] 的竞争分析中：
+- **Strength**：100K+ 开发者生态，快速执行
+- **UX Gap**：CLI-first，最小化可视化工具，无法直观理解复杂 Agent 关系
+- **Implication**：Nexus Spatial 的 3D 可视化填补了 CrewAI 的可视化空白
+
+## Related
+
+- [[LangChain]] / [[n8n]]：同类竞争产品
+- [[Nexus-Spatial]]：SpatialAIOps 产品定位，填补 CrewAI 可视化缺口