feat(harness): integrate walkinglabs 5-subsystem model with templates

- Add .harness/ directory with 6 templates:
  init.sh (unified startup entry)
  PROGRESS.md (session progress tracking)
  feature_list.json (machine-readable feature status)
  clean-state-checklist.md (end-of-session cleanup)
  session-handoff.md (cross-session handoff)
  evaluator-rubric.md (review scoring)
- Update AGENTS.md: 5-subsystem model (Instruction/Tools/Environment/State/Feedback)
- Add Init-Plan-Implement-Verify-Cleanup workflow cycle

.harness/feature_list.json

@@ -0,0 +1,50 @@
+{
+  "project": "OpenHIS",
+  "last_updated": "2026-05-28",
+  "rules": {
+    "single_active_feature": true,
+    "passing_requires_evidence": true,
+    "do_not_skip_verification": true
+  },
+  "status_legend": {
+    "not_started": "功能还没开始做",
+    "in_progress": "当前唯一正在进行的任务",
+    "blocked": "有已记录的阻塞问题",
+    "passing": "验证已通过，证据已记录",
+    "done": "已完成并合入主干"
+  },
+  "features": [
+    {
+      "id": "harness-001",
+      "priority": 1,
+      "area": "infrastructure",
+      "title": "Harness Engineering 基础设施搭建",
+      "user_visible_behavior": "Codex 具备完整的约束/反馈/控制/持久执行能力",
+      "status": "passing",
+      "verification": [
+        "AGENTS.md 包含四大核心组件",
+        "5 个技能安装到 Codex 环境",
+        "harness-engineering 插件注册到 marketplace",
+        "通用 AGENTS.md 模板可用"
+      ],
+      "evidence": ["AGENTS.md restructured", "skills created", "plugin validated"],
+      "notes": "初始搭建完成，可继续迭代"
+    },
+    {
+      "id": "harness-002",
+      "priority": 2,
+      "area": "infrastructure",
+      "title": "WalkingLabs 实战模式整合",
+      "user_visible_behavior": "项目具备完整的 5 子系统 Harness（指令/工具/环境/状态/反馈）",
+      "status": "in_progress",
+      "verification": [
+        ".harness/ 目录包含所有模板文件",
+        "init.sh 可正常运行",
+        "PROGRESS.md 记录当前状态",
+        "feature_list.json 跟踪所有功能"
+      ],
+      "evidence": [],
+      "notes": ""
+    }
+  ]
+}