Phase 0.1/1/3/6: 核心生产问题修复

Healthcheck 隔离 (Phase 0.1):
- 新增 internal/sdk/selftest.go: VirtualInstance 完全隔离自检空间
- PluginSDK.Selftest()/SelftestReset() 暴露隔离实例 (含 mutex)
- LLM 自检只读白名单 isSafeReadonlyTool 防写类工具污染生产
- 单测验证: healthcheck 后生产实例内容不变 + 无残留
- 存量清理: 删除 gotest/luatest 残留目录

GraphDB 去重 (Phase 1):
- migrateRelationUnique: 启动自动重建 relations 表加 UNIQUE 约束并去重
- Commit 改为存在性检查, 重复三元组仅刷新 confidence 不重复插入
- 3 个 dedup 单测全绿

配置时长解析 (Phase 3):
- parseDurationExtended 支持 2d/1w/3h 等人类可读单位
- GetDuration 全局生效, 防 2d 静默回退 30m

Agentcli 通知风暴治理 (Phase 6):
- 语义通知: 累积 notify_bytes(2KB) 或间隔 notify_interval(2s) 触发
- 生命周期即时通知: 启动/进程退出/EOF 立即通知
- 可配置 settings, 保留通知机制保证 agent 感知终端存在
- 运维止血: 已杀掉幽灵 PID 3716282 (bash git sparse clone 运行 16h)

Plan.md: 新增设计意图备忘(插件即App/分层记忆), 更新各 Phase 进度

internal/config/registry_test.go

@@ -210,6 +210,14 @@ func TestGetHelpers(t *testing.T) {
 	if got := r.GetDuration("dur_key", 0); got != 5*time.Minute {
 		t.Fatalf("GetDuration: expected 5m, got %v", got)
 	}
+	r.Set("dur_key_days", "2d")
+	if got := r.GetDuration("dur_key_days", 0); got != 48*time.Hour {
+		t.Fatalf("GetDuration d-unit: expected 48h, got %v", got)
+	}
+	r.Set("dur_key_weeks", "1w")
+	if got := r.GetDuration("dur_key_weeks", 0); got != 168*time.Hour {
+		t.Fatalf("GetDuration w-unit: expected 168h, got %v", got)
+	}
 	if got := r.GetDuration("nonexistent", 30*time.Second); got != 30*time.Second {
 		t.Fatalf("GetDuration fallback: expected 30s, got %v", got)
 	}
@@ -221,6 +229,42 @@ func TestGetHelpers(t *testing.T) {
 	}
 }
 
+func TestParseDurationExtended(t *testing.T) {
+	cases := []struct {
+		in      string
+		want    time.Duration
+		wantErr bool
+	}{
+		{"2d", 48 * time.Hour, false},
+		{"1w", 7 * 24 * time.Hour, false},
+		{"1d", 24 * time.Hour, false},
+		{"2d12h", 60 * time.Hour, false},
+		{"30m", 30 * time.Minute, false},
+		{"500ms", 500 * time.Millisecond, false},
+		{"1h30m", 90 * time.Minute, false},
+		{" 3d ", 72 * time.Hour, false},
+		{"2w", 336 * time.Hour, false},
+		{"", 0, true},
+		{"abc", 0, true},
+	}
+	for _, c := range cases {
+		got, err := parseDurationExtended(c.in)
+		if c.wantErr {
+			if err == nil {
+				t.Errorf("%q: expected error, got %v", c.in, got)
+			}
+			continue
+		}
+		if err != nil {
+			t.Errorf("%q: unexpected error: %v", c.in, err)
+			continue
+		}
+		if got != c.want {
+			t.Errorf("%q: expected %v, got %v", c.in, c.want, got)
+		}
+	}
+}
+
 func TestSnapshotRestoreCoreLLM(t *testing.T) {
 	r := NewConfigRegistry("")
 	defer r.Close()