feat(org): implement v3 constitution with three-layer architecture

- Add CONSTITUTION_v3.md with Brain/Ministry/Knowledge layers
- Add Val as Chief of Staff
- Add new roles: Oracle, Lab, Forge, Atlas
- Update Echo: Expression -> Expression & Experience
- Update Prism: Justice -> Reliability
- All Ministry report to Vector via standard flow (Quanta no exception)

org/agents/INDEX_v3.md

@@ -0,0 +1,61 @@
+# Agent Identity Cards Index (v3)
+
+> 版本：v3
+> 日期：2026-03-10
+> 对应宪章：CONSTITUTION_v3.md
+
+---
+
+## 三层架构
+
+### Chief of Staff
+- 🎯 Val → `VAL_CHIEF_OF_STAFF.md` ✅
+
+### Brain Layer
+- 🧠 Oracle (Strategy) → `BRAIN_STRATEGY_ORACLE.md` ✅
+- 🏛️ Helix (Architect) → `BRAIN_ARCHITECT_HELIX.md`
+- 🛡️ Sentinel (Auditor) → `BRAIN_AUDITOR_SENTINEL.md`
+- 🎛️ Vector (Orchestrator) → `BRAIN_CONTROLLER_VECTOR.md`
+
+### Ministry Layer
+- 👥 Catalyst (Talent) → `MINISTRY_TALENT_CATALYST.md`
+- 💰 Quanta (Resource) → `MINISTRY_RESOURCES_QUANTA.md`
+- 🛡️ Bastion (Security) → `MINISTRY_SECURITY_BASTION.md`
+- 🧪 Lab (Simulation) → `MINISTRY_SIMULATION_LAB.md` ✅
+- ⚙️ Anvil (Execution) → `MINISTRY_WORKS_ANVIL.md`
+- 🎨 Echo (Expression & Experience) → `MINISTRY_EXPRESSION_ECHO.md` ✅ 已更新
+- 🧩 Prism (Reliability) → `MINISTRY_RELIABILITY_PRISM.md` ✅ 已更新
+- 🔧 Forge (Tools) → `MINISTRY_TOOLS_FORGE.md` ✅
+
+### Knowledge Layer
+- 📚 Atlas (Memory) → `KNOWLEDGE_MEMORY_ATLAS.md` ✅
+
+---
+
+## 变更记录
+
+### 新增（v3）
+- Val Chief of Staff 角色卡
+- Oracle 策略分流角色卡
+- Lab 模拟测试角色卡
+- Forge 工具治理角色卡
+- Atlas 知识记忆角色卡
+
+### 更新（v3）
+- Echo: Expression → Expression & Experience
+- Prism: Justice → Reliability
+
+### 保留（v2/v1）
+- Helix, Sentinel, Vector
+- Catalyst, Quanta, Bastion, Anvil
+
+---
+
+## 标准汇报流程
+
+```
+Brain Layer → Vector
+Ministry Layer → Vector (标准流程，Quanta 无特殊)
+Vector → Val (Chief of Staff)
+Val → 谷老板 (重大决策)
+```