Move current SQLite identity guards out of obsolete store

docs/evidence/saas-dispatcher-implementation.md

@@ -102,6 +102,7 @@
 - Dispatcher 旧任务消费分支：删除 `task_runtime_v3`、`task_queue_v3`、`task_control_v3` 及其专属测试和仅依赖这些旧测试夹具的旧 Mock 恢复测试；当前 `CurrentRuntime`、`CurrentBootstrap`、`CurrentDiscoveryFollower` 和根命令隔离测试仍独立通过。
 - Dispatcher 旧本地执行与控制分支：删除 `local_v01`、旧 Mock 呼叫/上传/恢复、旧路由与时间策略、旧 `Dispatcher`/lease 实现及依赖它们的测试；现行命令、任务消费、录音/结果链路的定向测试继续通过。
 - Agent 会话共用边界：保留当前根命令使用的 `AgentCoordinator` 注册、状态探测、激活、最新会话授权和过期拒绝；移除仅供旧执行链路使用的 `ExecuteRaw`、旧控制、查询补偿与旧 SIP applied-config 核验及其测试。当前 SIP 门禁仍由现行加载回报与隔离测试校验，不冒充 Asterisk 实际加载；旧 MQ/Store 和其余契约尚待清理，不能将此批视为 P07 完成。
+- SQLite 代码归属：当前 Store 所需的 SQLite 驱动和 Dispatcher 身份/命令冲突错误已从旧 Store 迁到当前入口，保留拒绝旧布局及外来 Dispatcher 抢占的原测试。旧 Store 与迁移文件尚未删除；此改动只移动源码定义，不读取、改写或清理现存业务数据。
 
 ## 验收台账
 

internal/store/current.go

@@ -11,13 +11,18 @@ import (
 	"strings"
 
 	"git.ipao.vip/rogee/go-sip/internal/configread"
+	_ "modernc.org/sqlite"
 )
 
-// CurrentStore is the authority for the new numeric-tenant task model. It
-// deliberately refuses an old database instead of clearing or replaying data
-// whose owner/message identity cannot be proved safe to convert.
+// CurrentStore refuses an incompatible database instead of clearing or
+// replaying data whose owner and message identity cannot be proved safe.
 type CurrentStore struct{ db *sql.DB }
 
+var (
+	ErrCommandConflict            = errors.New("command id reused with different body")
+	ErrDispatcherIdentityMismatch = errors.New("database belongs to another dispatcher")
+)
+
 const currentSchema = `
 CREATE TABLE IF NOT EXISTS dispatcher_state (
     dispatcher_id TEXT PRIMARY KEY,

internal/store/identity.go

@@ -1,15 +1,12 @@
 package store
 
 import (
-	"errors"
 	"fmt"
 	"time"
 
 	"git.ipao.vip/rogee/go-sip/internal/tenant"
 )
 
-var ErrDispatcherIdentityMismatch = errors.New("database belongs to another dispatcher")
-
 // DispatcherID returns the already-bound database identity, never a new identity.
 func (s *Store) DispatcherID() (string, error) {
 	var id string

internal/store/store.go

@@ -17,7 +17,6 @@ import (
 	"git.ipao.vip/rogee/go-sip/internal/contract"
 	"git.ipao.vip/rogee/go-sip/internal/mq"
 	"git.ipao.vip/rogee/go-sip/internal/tenant"
-	_ "modernc.org/sqlite"
 )
 
 //go:embed migrations/*.sql
@@ -25,7 +24,6 @@ var migrations embed.FS
 
 var (
 	ErrDuplicateCommand = errors.New("duplicate command")
-	ErrCommandConflict  = errors.New("command id reused with different body")
 	ErrNoCapacity       = errors.New("quota capacity unavailable")
 	ErrCASConflict      = errors.New("control revision conflict")
 	ErrLeaseHeld        = errors.New("active lease held by another dispatcher")