feat: add member_context table (D110)

persona-brain-db/schema/20-member-context.sql

@@ -0,0 +1,19 @@
+-- ============================================================
+-- 表20：member_context（Layer 2 · 成员上下文 · D110新增）
+-- 用途：每个成员/开发人格体自己的上下文空间
+-- ============================================================
+
+CREATE TABLE IF NOT EXISTS member_context (
+  member_id         VARCHAR(32)   PRIMARY KEY,
+  member_name       VARCHAR(64)   NOT NULL,
+  domain            VARCHAR(64),                    -- 领域/负责范围
+  brain_version     VARCHAR(16),                    -- 当前共享大脑版本
+  last_wake_time    TIMESTAMP,
+  current_project   TEXT,
+  status            VARCHAR(16)   NOT NULL DEFAULT 'active'
+                    CHECK (status IN ('active', 'inactive', 'onboarding')),
+  created_at        TIMESTAMP     NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at        TIMESTAMP     NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_mc_status ON member_context(status);