Add multi-agent collaboration system with 16-person team and two-tier governance

- agents/README.md documents company principles (first principles + practical
  delivery), 6-stage collaboration flow, and two-tier governance: CEO has
  highest priority and final say; work groups self-govern internally for
  staffing, scheduling, technical choices within CEO-defined boundaries.
- 16 employees recruited to match CPU physical core count, enabling up to
  16 subagents to run in parallel. Each profile.md has independent name,
  background, strengths, weaknesses, and performance log.
- Roles: 1 CEO, 3 architects (lin/yang/huang), 5 engineers (zhao/chen/li/
  zhou/sun), 3 QA (wang/liu/xu), 2 DevOps (ma/hu), 1 designer (zhu),
  1 writer (deng), 1 security (cao).
- Five working groups defined under agents/groups/: grp-quality-core,
  grp-ai-plugins, grp-cli-ux (B3), grp-build-matrix, grp-security-audit.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

agents/groups/grp-cli-ux.md

@@ -0,0 +1,18 @@
+---
+group_id: grp-cli-ux
+name: CLI 体验小组
+members:
+  - engineer-zhao
+  - designer-zhu
+  - qa-wang
+mission: 改进 dstalk-cli 的交互体验、健壮性和可测试性
+lead: engineer-zhao
+created: 2026-05-27
+active_tasks:
+  - B3: CLI 交互增强（信号处理、状态命令、退出码语义、管道输入）
+---
+
+## 协作模式
+- 赵码：实现主体代码改动
+- 朱晴：定义交互文案和命令语义
+- 王测：编写非交互模式测试用例，验证退出码