feat: 段页式记忆流转、coldcontext 重命名与安全治理

记忆层：
- MemoryBlock 承载 FrameTS/PageSeq/PageKind/BlockRole/CallID
- coldcontext 归档与回填按完整页传递，工具调用参数和配对键不丢失
- 召回先估算总 token，超预算时按全局页相似度标记 inactive
- inactive 仅是 context 渲染期状态，不落盘、不进入 coldcontext，Prune 后重置
- Peek/确认/Remove 两阶段召回，失败保留冷上下文副本
- stablemem 记录 last_recalled_at，删块连带清理边

命名：
- internal/memory/document → internal/memory/coldcontext
- Doc/DocEvent/DocHit → ColdDoc/ColdEvent/ColdHit
- ContextToColdContext/RecentColdContexts/FindColdContexts
- 保留既有 JSON 标签、doc_ 文件前缀与 doc_count 状态键，兼容存量数据

安全治理：
- 工具策略门禁、安全配置、事件总线发布者身份与入站脱敏
- 声明式 SecurityAPI 与 QQ owner/guest profile
- 日志保留策略与相关 e2e/回归判据

验证：go build ./...、go vet ./...、go test ./...（62 包）；
生产副本 e2e：7013 块迁移后 ID/向量/指纹 0 变化、0 缺失。

internal/sdk/selftest.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/JianFeeeee/HologramAgent/internal/knowledge"
 	"github.com/JianFeeeee/HologramAgent/internal/memory"
-	doc "github.com/JianFeeeee/HologramAgent/internal/memory/document"
+	coldcontext "github.com/JianFeeeee/HologramAgent/internal/memory/coldcontext"
 	"github.com/JianFeeeee/HologramAgent/internal/memory/text"
 )
 
@@ -63,7 +63,7 @@ func (v *VirtualInstance) initLocked() error {
 	}
 	v.Knowledge = NewKnowledge(ks)
 
-	ds := doc.NewStore(filepath.Join(v.dir, "documents"), memory.TokenizeWords)
+	ds := coldcontext.NewStore(filepath.Join(v.dir, "documents"), memory.TokenizeWords)
 	if err := ds.Start(); err != nil {
 		return fmt.Errorf("virtual doc store: %w", err)
 	}