diff --git a/体己/AI/ModelStore.swift b/体己/AI/ModelStore.swift
index e9167a5..06ce918 100644
--- a/体己/AI/ModelStore.swift
+++ b/体己/AI/ModelStore.swift
@@ -19,7 +19,9 @@ enum ModelKind: String, CaseIterable {
     var sentinelFilename: String { "config.json" }
 }
 
-final class ModelStore {
+/// `@unchecked Sendable`:rootURL 是 let,方法只读 filesystem(线程安全),
+/// 可被任意 actor / Task 跨边界访问。
+final class ModelStore: @unchecked Sendable {
     static let shared: ModelStore = {
         do {
             let appSupport = try FileManager.default.url(
diff --git a/体己/Persistence/FileVault.swift b/体己/Persistence/FileVault.swift
index f11675d..0d42634 100644
--- a/体己/Persistence/FileVault.swift
+++ b/体己/Persistence/FileVault.swift
@@ -8,7 +8,9 @@ enum FileVaultError: Error {
     case decodeFailed
 }
 
-final class FileVault {
+/// `@unchecked Sendable`:rootURL 是 let,方法只 I/O 到沙盒目录(线程安全),
+/// 可被任意 actor / Task 跨边界访问。
+final class FileVault: @unchecked Sendable {
     static let shared: FileVault = {
         do {
             let appSupport = try FileManager.default.url(