docs/README.md

@@ -1,6 +1,6 @@
 # OpenNexus 文档索引
 
-最新：[2026-09-08 验收报告与 Sync 测试部署](development/OpenNexus验收报告-2026-09-08.md)。全量验收未通过，含已复现阻塞项与逐 ID 结果。
+最新：[2026-09-08 验收修复与全量回归](development/OpenNexus验收修复与回归-2026-09-08.md)。两项已复现缺陷已修复，现有自动化测试全部通过；完整生产化验收仍未通过。原始证据见[验收报告与 Sync 测试部署](development/OpenNexus验收报告-2026-09-08.md)。
 
 > 第二阶段收尾：标准 Agent/RAG Benchmark 与报告页、函数图预览、三格式快照导出及真实 Provider/MCP 结果见[实现与验收记录](development/第二阶段收尾实现与验收-2026-09-07.md)。当前分支尚未合并，不更改下文历史 main 基线。
 

docs/contracts/Host-v1契约.md

@@ -9,7 +9,9 @@
 | 命令 | 参数 / 返回 |
 | --- | --- |
 | `host_capabilities` | protocol=1，workspace/credentials=true；core 随进程状态返回；sync/extensions=false |
-| `core_request` | 代理认证 Sidecar 的 `/health` 与 `/api/*`；Host 注入会话和代际，支持 JSON 与限额二进制，不接受前端鉴权头 |
+| `core_request_prepare` | timeout_ms（1–600000），返回一次性 request_id；最多 64 个待执行/在途请求，默认前端超时 30000 ms |
+| `core_request` | request 对象含 requestId、method、path、body/bodyBase64、contentType、idempotencyKey；必须使用未过期的预登记 ID 且仅执行一次。代理认证 Sidecar 的 `/health` 与 `/api/*`，不接受前端鉴权头 |
+| `core_request_cancel` | request_id；取消未发送的预登记项或终止在途 HTTP Future，重复取消无副作用 |
 | `workspace_choose` | 原生选择，取消返回 null；成功返回 vault_id/path/name |
 | `workspace_open` | 只允许重开应用数据目录中已持久化授权的规范化路径 |
 | `workspace_recent` | 最近 20 个用户主动选择的 Vault；只保存身份、名称和路径 |
@@ -21,7 +23,9 @@
 | `workspace_delete` | path、expected；正文保存在 `.ainote/trash` |
 | `workspace_mkdir` | path，相对当前授权 Vault |
 
-当前错误通过 Tauri rejection 返回稳定 code，前端 `DesktopError` 保留该 code。主要 code 为 REVISION_CONFLICT、RECOVERY_CONFLICT、UNSAFE_PATH、PATH_CONFLICT、VAULT_ALREADY_OPEN、SCHEMA_INCOMPATIBLE、ATOMIC_REPLACE_FAILED。统一 request_id、取消标识及完整错误详情尚未固化。
+当前错误通过 Tauri rejection 返回稳定 code，前端 `DesktopError` 保留该 code。主要 code 为 REVISION_CONFLICT、RECOVERY_CONFLICT、UNSAFE_PATH、PATH_CONFLICT、VAULT_ALREADY_OPEN、SCHEMA_INCOMPATIBLE、ATOMIC_REPLACE_FAILED。常规 Core 请求新增 REQUEST_CANCELLED、REQUEST_TIMEOUT 及预登记错误；前端取消/超时错误带 request_id 和 outcome（not_sent/unknown）。已经发送的写入不能推断回滚，不自动重试；按业务 operation_id 确认提交结果的完整链路仍待实现。
+
+凭据保险库解锁前取得独立 `.lock` 文件的 OS 排他锁，持有至手动锁定、错误后锁定或实例销毁。其他实例返回 CREDENTIALS_BUSY，不读取旧快照后继续覆盖写入；错误口令释放临时锁，进程退出由 OS 释放。Windows 禁止在持锁期间替换该锁文件。
 
 ## 写入及恢复
 

docs/development/OpenNexus验收修复与回归-2026-09-08.json

@@ -0,0 +1,271 @@
+{
+  "date": "2026-09-08",
+  "base_commit": "6bf5127",
+  "known_defects": {
+    "F-01": "FIXED",
+    "F-02": "FIXED"
+  },
+  "automated_regression": "PASSED",
+  "production_acceptance": "NOT_PASSED",
+  "counts": {
+    "backend": {
+      "tests": 894,
+      "failures": 0,
+      "errors": 0,
+      "skipped": 0
+    },
+    "packaged-core": {
+      "tests": 4,
+      "failures": 0,
+      "errors": 0,
+      "skipped": 0
+    },
+    "sync": {
+      "tests": 23,
+      "failures": 0,
+      "errors": 0,
+      "skipped": 0
+    },
+    "community": {
+      "tests": 13,
+      "failures": 0,
+      "errors": 0,
+      "skipped": 0
+    },
+    "frontend": {
+      "tests": 504,
+      "failures": 0,
+      "errors": 0,
+      "skipped": 0
+    },
+    "rust": {
+      "passed": 28
+    }
+  },
+  "checks": [
+    {
+      "name": "rust-fmt",
+      "command": [
+        "cargo",
+        "fmt",
+        "--manifest-path",
+        "frontend/src-tauri/Cargo.toml",
+        "--check"
+      ],
+      "exit_code": 0,
+      "seconds": 0.383,
+      "finished_utc": "2026-09-08T05:09:44.693513+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-final-6bf5127"
+    },
+    {
+      "name": "rust-tests",
+      "command": [
+        "cargo",
+        "test",
+        "--manifest-path",
+        "frontend/src-tauri/Cargo.toml",
+        "--features",
+        "desktop",
+        "--all-targets",
+        "--locked"
+      ],
+      "exit_code": 0,
+      "seconds": 39.22,
+      "finished_utc": "2026-09-08T05:10:23.925087+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-final-6bf5127"
+    },
+    {
+      "name": "rust-clippy",
+      "command": [
+        "cargo",
+        "clippy",
+        "--manifest-path",
+        "frontend/src-tauri/Cargo.toml",
+        "--features",
+        "desktop",
+        "--all-targets",
+        "--locked",
+        "--",
+        "-D",
+        "warnings"
+      ],
+      "exit_code": 0,
+      "seconds": 3.526,
+      "finished_utc": "2026-09-08T05:10:27.480493+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-final-6bf5127"
+    },
+    {
+      "name": "backend",
+      "command": [
+        "uv",
+        "run",
+        "--directory",
+        "backend",
+        "pytest",
+        "-q",
+        "--junitxml=G:\\OSProject\\NotesAgent-phase3\\.build\\acceptance\\fixes-6bf5127\\backend.xml"
+      ],
+      "exit_code": 0,
+      "seconds": 199.768,
+      "finished_utc": "2026-09-08T05:06:18.641433+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-6bf5127"
+    },
+    {
+      "name": "packaged-core",
+      "command": [
+        "uv",
+        "run",
+        "--directory",
+        "backend",
+        "pytest",
+        "-q",
+        "tests/test_sidecar_auth.py",
+        "--junitxml=G:\\OSProject\\NotesAgent-phase3\\.build\\acceptance\\fixes-6bf5127\\packaged-core.xml"
+      ],
+      "exit_code": 0,
+      "seconds": 3.742,
+      "finished_utc": "2026-09-08T05:06:22.396738+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-6bf5127"
+    },
+    {
+      "name": "frontend",
+      "command": [
+        "pnpm",
+        "--dir",
+        "frontend",
+        "exec",
+        "vitest",
+        "run",
+        "--maxWorkers=2",
+        "--reporter=default",
+        "--reporter=junit",
+        "--outputFile.junit=G:\\OSProject\\NotesAgent-phase3\\.build\\acceptance\\fixes-final-6bf5127\\frontend.xml"
+      ],
+      "exit_code": 0,
+      "seconds": 56.45,
+      "finished_utc": "2026-09-08T05:10:40.765672+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-final-6bf5127"
+    },
+    {
+      "name": "types",
+      "command": [
+        "pnpm",
+        "--dir",
+        "frontend",
+        "type-check"
+      ],
+      "exit_code": 0,
+      "seconds": 7.819,
+      "finished_utc": "2026-09-08T05:10:48.619856+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-final-6bf5127"
+    },
+    {
+      "name": "build",
+      "command": [
+        "pnpm",
+        "--dir",
+        "frontend",
+        "build"
+      ],
+      "exit_code": 0,
+      "seconds": 34.154,
+      "finished_utc": "2026-09-08T05:11:22.812302+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-final-6bf5127"
+    },
+    {
+      "name": "sync",
+      "command": [
+        "uv",
+        "run",
+        "--directory",
+        "server sync",
+        "pytest",
+        "-q",
+        "--junitxml=G:\\OSProject\\NotesAgent-phase3\\.build\\acceptance\\fixes-6bf5127\\sync.xml"
+      ],
+      "exit_code": 0,
+      "seconds": 9.874,
+      "finished_utc": "2026-09-08T05:08:10.342428+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-6bf5127"
+    },
+    {
+      "name": "community",
+      "command": [
+        "uv",
+        "run",
+        "--directory",
+        "community-server",
+        "pytest",
+        "-q",
+        "--junitxml=G:\\OSProject\\NotesAgent-phase3\\.build\\acceptance\\fixes-6bf5127\\community.xml"
+      ],
+      "exit_code": 0,
+      "seconds": 3.162,
+      "finished_utc": "2026-09-08T05:08:13.520864+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-6bf5127"
+    },
+    {
+      "name": "smoke",
+      "command": [
+        "G:\\OSProject\\NotesAgent-phase3\\backend\\.venv\\Scripts\\python.exe",
+        "scripts/phase3-isolated-smoke.py"
+      ],
+      "exit_code": 0,
+      "seconds": 3.411,
+      "finished_utc": "2026-09-08T05:08:16.933393+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-6bf5127"
+    },
+    {
+      "name": "docs",
+      "command": [
+        "python",
+        "scripts/check-doc-links.py"
+      ],
+      "exit_code": 0,
+      "seconds": 7.01,
+      "finished_utc": "2026-09-08T05:11:29.830898+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-final-6bf5127"
+    },
+    {
+      "name": "diff",
+      "command": [
+        "git",
+        "diff",
+        "--check",
+        "--",
+        ".",
+        ":(exclude)backend/data/vault"
+      ],
+      "exit_code": 0,
+      "seconds": 0.119,
+      "finished_utc": "2026-09-08T05:11:29.989493+00:00",
+      "artifact_directory": ".build\\acceptance\\fixes-final-6bf5127"
+    }
+  ],
+  "remote_health": {
+    "checked_at": 1788844300.226044,
+    "url": "http://yui.kronecker.cc:18080",
+    "checks": [
+      {
+        "path": "/health",
+        "status": 200,
+        "expected": 200
+      },
+      {
+        "path": "/ready",
+        "status": 200,
+        "expected": 200
+      },
+      {
+        "path": "/sync/v1/handshake",
+        "status": 200,
+        "expected": 200
+      },
+      {
+        "path": "/sync/v1/vaults",
+        "status": 401,
+        "expected": 401
+      }
+    ]
+  }
+}

docs/development/OpenNexus验收修复与回归-2026-09-08.md

@@ -0,0 +1,42 @@
+# OpenNexus 验收修复与全量回归（2026-09-08）
+
+本次在 `feat/phase3-completion` 工作树、基线 `6bf5127` 上修复了原验收中复现的 F-01、F-02，并完成现有自动化测试的全量回归。原始失败记录保留在[首次验收报告](OpenNexus验收报告-2026-09-08.md)；本报告不将尚未实现或缺少证据的生产化验收目标标记为通过。
+
+## 修复内容
+
+### F-01：多个凭据 Broker 覆盖快照
+
+Stronghold 在读取快照前取得同目录独立锁文件的操作系统排他锁，并持有至凭据库锁定。第二个实例返回 `CREDENTIALS_BUSY`，设置页提供可理解的提示。锁文件独立于原子替换的快照文件；Windows 禁止其他句柄删除被持有的锁文件。解锁失败或进程退出时释放所有权。
+
+回归测试验证两个实例交接后两次写入均保留、错误密码不遗留锁，以及真实子进程持锁时拒绝并发解锁、子进程被终止后能重新解锁并读取已提交凭据。
+
+### F-02：桌面请求忽略取消和超时
+
+前端和 Rust Host 使用先预留、后派发的请求协议。已取消请求不会派发；等待预留期间取消后，迟到的预留会被清理。Host 对请求使用独立截止时间和取消信号，限制最多 64 个预留，拒绝重复执行，并在退出时清理状态。取消正在读取的 HTTP 响应会丢弃请求 Future，真实 TCP 测试验证连接关闭。普通桌面请求默认超时 30 秒，可配置至 600 秒。
+
+前端清理计时器和监听器，保留二进制传输。写请求派发后取消或超时会报告结果未知，提示先检查业务结果，不自动重试。取消不代表服务端事务回滚；业务提交结果查询仍未完成，不能据此认定完整 A-03 验收通过。协议详见 [Host v1 契约](../contracts/Host-v1契约.md)。
+
+## 测试结果
+
+| 范围 | 最终结果 |
+| --- | --- |
+| 后端 pytest | 894 通过 |
+| 前端 Vitest | 93 个文件，504 通过 |
+| Rust desktop 全目标测试（locked） | 28 通过 |
+| Sync pytest | 23 通过 |
+| Community pytest | 13 通过 |
+| 打包 Core 认证回归 | 4 通过（单独运行，和后端套件有重叠） |
+| 三服务隔离冒烟测试 | 通过 |
+| 前端类型检查、生产构建 | 通过；构建仍提示部分 chunk 大于 500 kB |
+| Rust fmt、Clippy 全目标 `-D warnings` | 通过 |
+| 文档链接、变更空白检查 | 通过 |
+
+本地完整命令、退出码和日志位于 `.build/acceptance/fixes-6bf5127/` 与 `.build/acceptance/fixes-final-6bf5127/`。随文的 JSON 汇总保存命令和最终结果；原始日志属于本地构建产物。首轮新增 TCP 测试因同步等待阻塞 Tokio 清理而失败，改为异步等待线程结束；Clippy 发现 Host 参数数量超限，改为严格的结构化请求 DTO。修复后 Rust、前端及构建检查均重新通过，未改动的 Python 服务沿用本轮先前已通过结果。编辑器测试仅调整冷启动等待预算，保留原有断言。
+
+## Sync 测试部署复核
+
+对 [Sync 测试服务](http://yui.kronecker.cc:18080) 的公网复核结果为：`/health`、`/ready`、`/sync/v1/handshake` 返回 200，未认证访问 `/sync/v1/vaults` 返回 401。本次修复只涉及桌面端，未重新部署服务。此前 100 MiB 上传下载、并发 CAS、重启持久性等证据仍以首次验收报告为准，本次没有重复这些远程压力测试。
+
+## 验收边界
+
+本次结论为已知缺陷关闭、现有自动化回归通过。完整生产化验收仍未通过：操作系统级插件隔离、扩展管理、完整 Rust 同步客户端等规划能力仍有未完成项；本次也没有补充 MSVC 安装包、真实双设备桌面操作和完整故障矩阵的验收证据。不能将测试数视为规划中 30 个验收 ID 全部完成。用户 Vault 文件未纳入本次修改或提交。

frontend/src-tauri/Cargo.lock

@@ -2941,6 +2941,7 @@ dependencies = [
  "tauri",
  "tauri-build",
  "tempfile",
+ "tokio",
  "uuid",
  "zeroize",
 ]
@@ -5090,9 +5091,21 @@ dependencies = [
  "mio",
  "pin-project-lite",
  "socket2",
+ "tokio-macros",
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "tokio-macros"
+version = "2.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78773a2a397f451582ce068015985c33193cf6dea8b74d2a639fe457b2f07b0e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 3.0.5",
+]
+
 [[package]]
 name = "tokio-rustls"
 version = "0.26.5"

frontend/src-tauri/Cargo.toml

@@ -14,7 +14,7 @@ required-features = ["desktop"]
 
 [features]
 default = []
-desktop = ["dep:tauri", "dep:tauri-build", "dep:rfd", "dep:reqwest", "dep:base64"]
+desktop = ["dep:tauri", "dep:tauri-build", "dep:rfd", "dep:reqwest", "dep:base64", "dep:tokio"]
 
 [dependencies]
 serde = { version = "1", features = ["derive"] }
@@ -28,6 +28,7 @@ tauri = { version = "2", optional = true, features = ["tray-icon"] }
 rfd = { version = "0.15", optional = true }
 reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"], optional = true }
 base64 = { version = "0.22", optional = true }
+tokio = { version = "1", features = ["rt", "sync", "time", "macros"], optional = true }
 hmac = { version = "0.12", default-features = false }
 rand = { version = "0.8", default-features = false, features = ["getrandom"] }
 zeroize = { version = "1", default-features = false, features = ["alloc"] }

frontend/src-tauri/build.rs

@@ -22,6 +22,8 @@ fn main() {
             "credentials_change_password",
             "credentials_import",
             "core_request",
+            "core_request_prepare",
+            "core_request_cancel",
             "core_stream",
             "core_stream_cancel",
             "editor_capabilities",

frontend/src-tauri/capabilities/main.json

@@ -14,6 +14,8 @@
     "allow-credentials-change-password",
     "allow-credentials-import",
     "allow-core-request",
+    "allow-core-request-prepare",
+    "allow-core-request-cancel",
     "allow-core-stream",
     "allow-core-stream-cancel",
     "allow-workspace-choose",

frontend/src-tauri/permissions/autogenerated/core_request_cancel.toml

@@ -0,0 +1,11 @@
+# Automatically generated - DO NOT EDIT!
+
+[[permission]]
+identifier = "allow-core-request-cancel"
+description = "Enables the core_request_cancel command without any pre-configured scope."
+commands.allow = ["core_request_cancel"]
+
+[[permission]]
+identifier = "deny-core-request-cancel"
+description = "Denies the core_request_cancel command without any pre-configured scope."
+commands.deny = ["core_request_cancel"]

frontend/src-tauri/permissions/autogenerated/core_request_prepare.toml

@@ -0,0 +1,11 @@
+# Automatically generated - DO NOT EDIT!
+
+[[permission]]
+identifier = "allow-core-request-prepare"
+description = "Enables the core_request_prepare command without any pre-configured scope."
+commands.allow = ["core_request_prepare"]
+
+[[permission]]
+identifier = "deny-core-request-prepare"
+description = "Denies the core_request_prepare command without any pre-configured scope."
+commands.deny = ["core_request_prepare"]

frontend/src-tauri/src/credentials.rs

@@ -201,6 +201,9 @@ impl Unlocked {
 pub struct CredentialBroker {
     path: PathBuf,
     unlocked: Option<Unlocked>,
+    // Separate stable inode: snapshots are atomically replaced, so locking the
+    // snapshot itself would not protect the next writer after replacement.
+    ownership: Option<fs::File>,
 }
 
 impl CredentialBroker {
@@ -479,6 +482,7 @@ impl CredentialBroker {
         Self {
             path,
             unlocked: None,
+            ownership: None,
         }
     }
     pub fn is_locked(&self) -> bool {
@@ -486,9 +490,50 @@ impl CredentialBroker {
     }
     pub fn lock(&mut self) {
         self.unlocked.take();
+        self.ownership.take();
     }
     pub fn unlock(&mut self, password: Zeroizing<Vec<u8>>) -> Result<()> {
         self.lock();
+        use fs2::FileExt;
+        let parent = self.path.parent().ok_or("CREDENTIAL_PATH_INVALID")?;
+        fs::create_dir_all(parent).map_err(|_| "CREDENTIAL_IO_FAILED")?;
+        let mut lock_name = self
+            .path
+            .file_name()
+            .ok_or("CREDENTIAL_PATH_INVALID")?
+            .to_os_string();
+        lock_name.push(".lock");
+        let lock_path = parent.join(lock_name);
+        if let Ok(metadata) = fs::symlink_metadata(&lock_path) {
+            if !metadata.is_file() || metadata.file_type().is_symlink() {
+                return Err("CREDENTIAL_PATH_INVALID".into());
+            }
+            #[cfg(windows)]
+            {
+                use std::os::windows::fs::MetadataExt;
+                if metadata.file_attributes() & 0x400 != 0 {
+                    return Err("CREDENTIAL_PATH_INVALID".into());
+                }
+            }
+        }
+        let mut options = fs::OpenOptions::new();
+        options.read(true).write(true).create(true).truncate(false);
+        #[cfg(windows)]
+        {
+            use std::os::windows::fs::OpenOptionsExt;
+            options.share_mode(0x1 | 0x2); // Do not allow replacing the held lock file.
+        }
+        #[cfg(unix)]
+        {
+            use std::os::unix::fs::OpenOptionsExt;
+            options.mode(0o600);
+        }
+        let ownership = options
+            .open(&lock_path)
+            .map_err(|_| "CREDENTIAL_IO_FAILED")?;
+        ownership
+            .try_lock_exclusive()
+            .map_err(|_| "CREDENTIALS_BUSY")?;
         let session = if self.path.exists() {
             let metadata = fs::symlink_metadata(&self.path).map_err(|_| "CREDENTIAL_IO_FAILED")?;
             if !metadata.is_file() || metadata.len() > MAX_FILE {
@@ -530,6 +575,7 @@ impl CredentialBroker {
             session
         };
         self.unlocked = Some(session);
+        self.ownership = Some(ownership);
         Ok(())
     }
     pub fn list(&self) -> Result<Vec<CredentialId>> {

frontend/src-tauri/src/lib.rs

@@ -3,5 +3,7 @@
 pub mod core;
 pub mod credentials;
 pub mod recent;
+#[cfg(feature = "desktop")]
+pub mod request_lifecycle;
 mod runtime_compat;
 pub mod workspace;

frontend/src-tauri/src/main.rs

@@ -6,6 +6,7 @@ use base64::{engine::general_purpose::STANDARD as BASE64_STANDARD, Engine as _};
 use notesagent_host::core::CoreSupervisor;
 use notesagent_host::credentials::CredentialBroker;
 use notesagent_host::recent::{RecentVault, RecentVaultStore};
+use notesagent_host::request_lifecycle::Requests;
 use notesagent_host::workspace::{portable_path_string, Document, Entry, Workspace};
 use std::collections::HashMap;
 use std::path::Path;
@@ -16,6 +17,7 @@ use zeroize::Zeroizing;
 
 #[derive(Default)]
 struct Host {
+    requests: Requests,
     workspace: Mutex<Option<Workspace>>,
     recent: Mutex<Option<RecentVaultStore>>,
     core: Arc<Mutex<Option<CoreSupervisor>>>,
@@ -87,6 +89,14 @@ fn core_url(path: &str) -> Result<String, String> {
 mod core_proxy_tests {
     use super::{core_url, is_json_content_type};
 
+    #[test]
+    fn request_dto_accepts_camel_case_and_rejects_unowned_headers() {
+        let mut payload = serde_json::json!({"requestId":"fixture-reservation","method":"POST","path":"/api/tasks","body":{"title":"fixture"},"contentType":"application/json"});
+        assert!(serde_json::from_value::<super::CoreRequest>(payload.clone()).is_ok());
+        payload["authorization"] = serde_json::json!("must-not-be-forwarded");
+        assert!(serde_json::from_value::<super::CoreRequest>(payload).is_err());
+    }
+
     #[test]
     fn only_allows_expected_loopback_paths() {
         assert_eq!(core_url("/health").unwrap(), "http://127.0.0.1:8000/health");
@@ -118,15 +128,51 @@ mod core_proxy_tests {
 
 /// Authenticated process-local transport; session headers are owned by Rust.
 #[tauri::command]
-async fn core_request(
+fn core_request_prepare(host: State<'_, Host>, timeout_ms: u64) -> Result<String, String> {
+    host.requests.prepare(timeout_ms)
+}
+
+#[tauri::command]
+fn core_request_cancel(host: State<'_, Host>, request_id: String) -> Result<(), String> {
+    host.requests.cancel(&request_id)
+}
+
+#[derive(serde::Deserialize)]
+#[serde(rename_all = "camelCase", deny_unknown_fields)]
+struct CoreRequest {
+    request_id: String,
     method: String,
     path: String,
     body: Option<serde_json::Value>,
     body_base64: Option<String>,
     content_type: Option<String>,
     idempotency_key: Option<String>,
-    host: State<'_, Host>,
+}
-) -> Result<CoreResponse, String> {
+
+#[tauri::command]
+async fn core_request(request: CoreRequest, host: State<'_, Host>) -> Result<CoreResponse, String> {
+    let CoreRequest {
+        request_id,
+        method,
+        path,
+        body,
+        body_base64,
+        content_type,
+        idempotency_key,
+    } = request;
+    let mut lease = host.requests.claim(&request_id)?;
+    let checkpoint = lease.checkpoint();
+    lease
+        .run(async {
+            if body.is_some() && body_base64.is_some() {
+                return Err("CORE_BODY_INVALID".into());
+            }
+            if body
+                .as_ref()
+                .is_some_and(|value| value.to_string().len() > MAX_CORE_RESPONSE_BYTES)
+            {
+                return Err("CORE_REQUEST_TOO_LARGE".into());
+            }
             let core = host.core.clone();
             let core_path = path.clone();
             let session = tauri::async_runtime::spawn_blocking(move || {
@@ -151,7 +197,7 @@ async fn core_request(
                 return Err("CORE_METHOD_DENIED".into());
             }
             let client = reqwest::Client::builder()
-        .timeout(Duration::from_secs(30))
+                .timeout(Duration::from_secs(600))
                 .redirect(reqwest::redirect::Policy::none())
                 .no_proxy()
                 .build()
@@ -162,7 +208,8 @@ async fn core_request(
                     reqwest::header::AUTHORIZATION,
                     session.authorization.as_str(),
                 )
-        .header("X-Core-Generation", &session.generation);
+                .header("X-Core-Generation", &session.generation)
+                .header("X-Request-Id", &request_id);
             if let Some(value) = body {
                 request = request.json(&value);
             }
@@ -192,6 +239,7 @@ async fn core_request(
                 }
                 request = request.header("Idempotency-Key", key);
             }
+            checkpoint()?;
             let mut response = request.send().await.map_err(|_| "CORE_UNAVAILABLE")?;
             let status = response.status().as_u16();
             let content_type = response
@@ -227,6 +275,8 @@ async fn core_request(
                 body,
                 body_base64,
             })
+        })
+        .await
 }
 
 #[tauri::command]
@@ -627,6 +677,8 @@ fn main() {
             credentials_change_password,
             credentials_import,
             core_request,
+            core_request_prepare,
+            core_request_cancel,
             core_stream,
             core_stream_cancel,
             editor_capabilities,

frontend/src-tauri/src/request_lifecycle.rs

@@ -0,0 +1,236 @@
+//! Reserve before dispatch so cancellation cannot race a delayed IPC invocation.
+use std::{
+    collections::HashMap,
+    future::Future,
+    sync::{Arc, Mutex},
+    time::{Duration, Instant},
+};
+use tokio::sync::watch;
+
+struct Entry {
+    deadline: Instant,
+    claimed: bool,
+    cancel: watch::Sender<bool>,
+}
+#[derive(Default, Clone)]
+pub struct Requests {
+    entries: Arc<Mutex<HashMap<String, Entry>>>,
+}
+pub struct Lease {
+    id: String,
+    owner: Requests,
+    deadline: Instant,
+    cancel: watch::Receiver<bool>,
+}
+
+impl Requests {
+    pub fn prepare(&self, timeout_ms: u64) -> Result<String, String> {
+        if !(1..=600_000).contains(&timeout_ms) {
+            return Err("CORE_TIMEOUT_INVALID".into());
+        }
+        let mut entries = self.entries.lock().map_err(|_| "HOST_BUSY")?;
+        entries.retain(|_, entry| entry.claimed || entry.deadline > Instant::now());
+        if entries.len() >= 64 {
+            return Err("CORE_REQUEST_LIMIT".into());
+        }
+        let id = uuid::Uuid::new_v4().to_string();
+        let (cancel, _) = watch::channel(false);
+        entries.insert(
+            id.clone(),
+            Entry {
+                deadline: Instant::now() + Duration::from_millis(timeout_ms),
+                claimed: false,
+                cancel,
+            },
+        );
+        Ok(id)
+    }
+    pub fn claim(&self, id: &str) -> Result<Lease, String> {
+        let mut entries = self.entries.lock().map_err(|_| "HOST_BUSY")?;
+        let entry = entries.get_mut(id).ok_or("CORE_REQUEST_NOT_PREPARED")?;
+        if entry.claimed {
+            return Err("CORE_REQUEST_ALREADY_STARTED".into());
+        }
+        if entry.deadline <= Instant::now() {
+            entries.remove(id);
+            return Err("REQUEST_TIMEOUT".into());
+        }
+        entry.claimed = true;
+        Ok(Lease {
+            id: id.into(),
+            owner: self.clone(),
+            deadline: entry.deadline,
+            cancel: entry.cancel.subscribe(),
+        })
+    }
+    pub fn cancel(&self, id: &str) -> Result<(), String> {
+        if let Some(entry) = self.entries.lock().map_err(|_| "HOST_BUSY")?.remove(id) {
+            entry.cancel.send_replace(true);
+        }
+        Ok(())
+    }
+}
+impl Lease {
+    /// Recheck after synchronous encoding/validation, immediately before network IO.
+    pub fn checkpoint(&self) -> impl Fn() -> Result<(), String> + Send + 'static {
+        let cancel = self.cancel.clone();
+        let deadline = self.deadline;
+        move || {
+            if *cancel.borrow() {
+                return Err("REQUEST_CANCELLED".into());
+            }
+            if deadline <= Instant::now() {
+                return Err("REQUEST_TIMEOUT".into());
+            }
+            Ok(())
+        }
+    }
+    pub async fn run<T>(
+        &mut self,
+        operation: impl Future<Output = Result<T, String>>,
+    ) -> Result<T, String> {
+        // Check current state before polling an operation with possible side effects.
+        if *self.cancel.borrow() {
+            return Err("REQUEST_CANCELLED".into());
+        }
+        if self.deadline <= Instant::now() {
+            return Err("REQUEST_TIMEOUT".into());
+        }
+        tokio::select! {
+            biased;
+            _ = self.cancel.changed() => Err("REQUEST_CANCELLED".into()),
+            _ = tokio::time::sleep_until(self.deadline.into()) => Err("REQUEST_TIMEOUT".into()),
+            value = operation => value,
+        }
+    }
+}
+impl Drop for Lease {
+    fn drop(&mut self) {
+        if let Ok(mut entries) = self.owner.entries.lock() {
+            entries.remove(&self.id);
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[tokio::test]
+    async fn cancellation_before_dispatch_and_replay_never_run_work() {
+        let requests = Requests::default();
+        let id = requests.prepare(1000).unwrap();
+        requests.cancel(&id).unwrap();
+        assert!(requests.claim(&id).is_err());
+        let id = requests.prepare(1000).unwrap();
+        let mut lease = requests.claim(&id).unwrap();
+        assert!(requests.claim(&id).is_err());
+        requests.cancel(&id).unwrap();
+        let result: Result<(), String> = lease
+            .run(async { panic!("cancelled work was polled") })
+            .await;
+        assert_eq!(result.unwrap_err(), "REQUEST_CANCELLED");
+    }
+    #[tokio::test]
+    async fn timeout_and_cancel_drop_inflight_work_and_release_capacity() {
+        let requests = Requests::default();
+        let id = requests.prepare(10).unwrap();
+        let mut lease = requests.claim(&id).unwrap();
+        assert_eq!(
+            lease
+                .run(std::future::pending::<Result<(), String>>())
+                .await
+                .unwrap_err(),
+            "REQUEST_TIMEOUT"
+        );
+        drop(lease);
+        assert!(requests.entries.lock().unwrap().is_empty());
+        let id = requests.prepare(1000).unwrap();
+        let mut lease = requests.claim(&id).unwrap();
+        let (result, ()) = tokio::join!(
+            lease.run(std::future::pending::<Result<(), String>>()),
+            async {
+                tokio::task::yield_now().await;
+                requests.cancel(&id).unwrap();
+            }
+        );
+        assert_eq!(result.unwrap_err(), "REQUEST_CANCELLED");
+        drop(lease);
+        assert!(requests.entries.lock().unwrap().is_empty());
+    }
+    #[test]
+    fn capacity_and_expired_reservations_are_bounded() {
+        let requests = Requests::default();
+        for _ in 0..64 {
+            requests.prepare(1000).unwrap();
+        }
+        assert_eq!(requests.prepare(1000).unwrap_err(), "CORE_REQUEST_LIMIT");
+        for entry in requests.entries.lock().unwrap().values_mut() {
+            entry.deadline = Instant::now();
+        }
+        assert!(requests.prepare(1000).is_ok());
+    }
+    #[tokio::test]
+    async fn cancelling_a_real_response_closes_its_socket() {
+        use std::io::{Read, Write};
+        let listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap();
+        let endpoint = listener.local_addr().unwrap();
+        let (started, received) = tokio::sync::oneshot::channel();
+        let server = std::thread::spawn(move || {
+            let (mut socket, _) = listener.accept().unwrap();
+            socket
+                .set_read_timeout(Some(Duration::from_secs(5)))
+                .unwrap();
+            let mut request = Vec::new();
+            while !request.ends_with(b"\r\n\r\n") {
+                let mut byte = [0];
+                socket.read_exact(&mut byte).unwrap();
+                request.push(byte[0]);
+            }
+            socket
+                .write_all(
+                    b"HTTP/1.1 200 OK\r\nContent-Length: 1000000\r\nConnection: close\r\n\r\nx",
+                )
+                .unwrap();
+            started.send(()).unwrap();
+            match socket.read(&mut [0]) {
+                Ok(0) => true,
+                Err(error) => matches!(
+                    error.kind(),
+                    std::io::ErrorKind::ConnectionReset | std::io::ErrorKind::ConnectionAborted
+                ),
+                _ => false,
+            }
+        });
+        let requests = Requests::default();
+        let id = requests.prepare(10000).unwrap();
+        let mut lease = requests.claim(&id).unwrap();
+        let operation = async {
+            let mut response = reqwest::Client::builder()
+                .no_proxy()
+                .build()
+                .unwrap()
+                .get(format!("http://{endpoint}/"))
+                .send()
+                .await
+                .map_err(|_| "HTTP_FAILURE".to_string())?;
+            while response
+                .chunk()
+                .await
+                .map_err(|_| "BODY_FAILURE".to_string())?
+                .is_some()
+            {}
+            Ok(())
+        };
+        let (result, ()) = tokio::join!(lease.run(operation), async {
+            received.await.unwrap();
+            requests.cancel(&id).unwrap();
+        });
+        assert_eq!(result.unwrap_err(), "REQUEST_CANCELLED");
+        assert!(
+            tokio::task::spawn_blocking(move || server.join().unwrap())
+                .await
+                .unwrap(),
+            "HTTP socket was not closed on cancellation"
+        );
+    }
+}

frontend/src-tauri/tests/credential_ownership.rs

@@ -0,0 +1,114 @@
+use notesagent_host::credentials::{CredentialBroker, CredentialId, Scope};
+use zeroize::Zeroizing;
+fn password() -> Zeroizing<Vec<u8>> {
+    Zeroizing::new(b"isolated-ownership-fixture".to_vec())
+}
+#[test]
+fn stale_writer_is_rejected_then_handoff_preserves_both_commits() {
+    let temp = tempfile::tempdir().unwrap();
+    let path = temp.path().join("vault");
+    let a = CredentialId::legacy("first");
+    let b = CredentialId::legacy("second");
+    let mut one = CredentialBroker::new(path.clone());
+    one.unlock(password()).unwrap();
+    let mut two = CredentialBroker::new(path.clone());
+    assert_eq!(two.unlock(password()).unwrap_err(), "CREDENTIALS_BUSY");
+    assert!(two.is_locked());
+    one.put(&a, Zeroizing::new(b"fixture-a".to_vec())).unwrap();
+    assert_eq!(
+        two.put(&b, Zeroizing::new(b"fixture-b".to_vec()))
+            .unwrap_err(),
+        "CREDENTIALS_LOCKED"
+    );
+    one.lock();
+    two.unlock(password()).unwrap();
+    assert!(two.resolve(&Scope::Provider, &a).unwrap().is_some());
+    two.put(&b, Zeroizing::new(b"fixture-b".to_vec())).unwrap();
+    two.lock();
+    // A failed password attempt must release its ownership too.
+    assert!(one
+        .unlock(Zeroizing::new(b"wrong-fixture-password".to_vec()))
+        .is_err());
+    two.unlock(password()).unwrap();
+    assert!(two.resolve(&Scope::Provider, &a).unwrap().is_some());
+    assert!(two.resolve(&Scope::Provider, &b).unwrap().is_some());
+}
+
+#[test]
+fn process_lock_is_exclusive_and_released_on_crash() {
+    use std::io::{BufRead, Read, Write};
+    use std::process::{Command, Stdio};
+    if let Ok(role) = std::env::var("OPENNEXUS_OWNERSHIP_TEST_ROLE") {
+        let path =
+            std::path::PathBuf::from(std::env::var_os("OPENNEXUS_OWNERSHIP_TEST_PATH").unwrap());
+        let mut broker = CredentialBroker::new(path);
+        if role == "blocked" {
+            assert_eq!(broker.unlock(password()).unwrap_err(), "CREDENTIALS_BUSY");
+            return;
+        }
+        broker.unlock(password()).unwrap();
+        broker
+            .put(
+                &CredentialId::legacy("child"),
+                Zeroizing::new(b"child-fixture".to_vec()),
+            )
+            .unwrap();
+        println!("OWNERSHIP_READY");
+        std::io::stdout().flush().unwrap();
+        let _ = std::io::stdin().read_exact(&mut [0]);
+        return;
+    }
+    let temp = tempfile::tempdir().unwrap();
+    let path = temp.path().join("vault");
+    let mut broker = CredentialBroker::new(path.clone());
+    broker.unlock(password()).unwrap();
+    let command = |role: &str| {
+        let mut c = Command::new(std::env::current_exe().unwrap());
+        c.args([
+            "--exact",
+            "process_lock_is_exclusive_and_released_on_crash",
+            "--nocapture",
+        ])
+        .env("OPENNEXUS_OWNERSHIP_TEST_ROLE", role)
+        .env("OPENNEXUS_OWNERSHIP_TEST_PATH", &path);
+        c
+    };
+    assert!(command("blocked")
+        .stdout(Stdio::null())
+        .status()
+        .unwrap()
+        .success());
+    broker.lock();
+    let mut child = command("owner")
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .spawn()
+        .unwrap();
+    let output = child.stdout.take().unwrap();
+    let (sender, receiver) = std::sync::mpsc::channel();
+    std::thread::spawn(move || {
+        for line in std::io::BufReader::new(output)
+            .lines()
+            .map_while(Result::ok)
+        {
+            if line == "OWNERSHIP_READY" {
+                let _ = sender.send(());
+                break;
+            }
+        }
+    });
+    let ready = receiver
+        .recv_timeout(std::time::Duration::from_secs(30))
+        .is_ok();
+    if ready {
+        assert_eq!(broker.unlock(password()).unwrap_err(), "CREDENTIALS_BUSY");
+    }
+    child.kill().unwrap();
+    child.wait().unwrap();
+    assert!(ready, "child never acquired ownership");
+    broker.unlock(password()).unwrap();
+    assert!(broker
+        .resolve(&Scope::Provider, &CredentialId::legacy("child"))
+        .unwrap()
+        .is_some());
+}

frontend/src/features/editor/EditorPane.spec.ts

@@ -63,10 +63,10 @@ describe('EditorPane file switching', () => {
     wrapper = mount(EditorPane, { attachTo: document.body })
     await nextTick()
 
-    await vi.waitFor(() => expect(wrapper!.find('.cm-content').exists()).toBe(true))
+    await vi.waitFor(() => expect(wrapper!.find('.cm-content').exists()).toBe(true), { timeout: 10000 })
     const textarea = wrapper.get('.cm-content')
     expect(textarea.attributes('spellcheck')).toBe('true')
     expect(textarea.attributes('lang')).toBe('en')
     expect(textarea.attributes('aria-label')).toBe('Markdown source editor')
-  })
+  }, 15000) // Lazy source-editor module transforms need the same cold-start budget.
 })

frontend/src/features/settings/CredentialVaultSettings.vue

@@ -8,6 +8,12 @@ const busy = ref(false)
 const password = ref('')
 const confirmation = ref('')
 const message = ref('')
+function failureMessage(error: unknown, fallback: string) {
+  const code = error instanceof Error ? error.message : fallback
+  return code === 'CREDENTIALS_BUSY'
+    ? t('保险库正在使用中，请等待当前操作完成，或在其他 OpenNexus 实例中锁定后重试。', 'The vault is busy. Wait for the current operation, or lock it in the other OpenNexus instance before retrying.')
+    : code
+}
 async function refresh() {
   const state = await hostInvoke<{ locked: boolean }>('credentials_status')
   locked.value = state.locked
@@ -17,7 +23,7 @@ async function importLegacy() {
   try {
     const count = await hostInvoke<number | null>('credentials_import')
     if (count !== null) message.value = t(`已迁移并验证 ${count} 条凭据；旧文件仍保留。`, `Imported and verified ${count} credentials. Legacy files are retained.`)
-  } catch (error) { message.value = error instanceof Error ? error.message : 'MIGRATION_FAILED' }
+  } catch (error) { message.value = failureMessage(error, 'MIGRATION_FAILED') }
   finally { busy.value = false }
 }
 async function act(action: 'unlock' | 'lock' | 'change_password') {
@@ -33,7 +39,7 @@ async function act(action: 'unlock' | 'lock' | 'change_password') {
     await hostInvoke(`credentials_${action}`, action === 'lock' ? undefined : { password: value })
     await refresh()
     message.value = action === 'change_password' ? t('口令已更新。', 'Password updated.') : ''
-  } catch (error) { message.value = error instanceof Error ? error.message : 'CREDENTIAL_STORE_FAILED' }
+  } catch (error) { message.value = failureMessage(error, 'CREDENTIAL_STORE_FAILED') }
   finally { busy.value = false }
 }
 onMounted(() => refresh().catch(error => { message.value = String(error) }))

frontend/src/services/apiClient.cancellation.spec.ts

@@ -0,0 +1,49 @@
+// @vitest-environment happy-dom
+import { expect, it, vi, beforeEach, afterEach } from 'vitest'
+const { hostInvoke } = vi.hoisted(() => ({ hostInvoke: vi.fn() }))
+vi.mock('./platform/desktop', () => ({ isDesktop: () => true, hostInvoke }))
+import apiClient from './apiClient'
+beforeEach(() => {
+  hostInvoke.mockReset()
+  hostInvoke.mockImplementation(command => command === 'core_request_prepare' ? Promise.resolve('reservation') :
+    command === 'core_request_cancel' ? Promise.resolve() : new Promise(() => {}))
+})
+afterEach(() => vi.useRealTimers())
+it('never invokes Host for a pre-aborted mutation', async () => {
+  const abort = new AbortController(); abort.abort()
+  await expect(apiClient.post('/api/tasks', {}, { signal: abort.signal })).rejects.toMatchObject({ code: 'REQUEST_CANCELLED', details: { outcome: 'not_sent' } })
+  expect(hostInvoke).not.toHaveBeenCalled()
+})
+it('rejects on deadline and cancels the native work rather than awaiting its response', async () => {
+  vi.useFakeTimers()
+  const result = expect(apiClient.post('/api/tasks', {}, { timeoutMs: 10 })).rejects.toMatchObject({ code: 'REQUEST_TIMEOUT', details: { outcome: 'unknown' } })
+  await vi.advanceTimersByTimeAsync(10); await result
+  expect(hostInvoke).toHaveBeenCalledWith('core_request_cancel', { requestId: 'reservation' })
+  expect(vi.getTimerCount()).toBe(0)
+})
+it('cancels a late reservation without dispatching after the caller has aborted', async () => {
+  let reserve!: (id: string) => void
+  hostInvoke.mockImplementationOnce(() => new Promise(resolve => { reserve = resolve }))
+  const abort = new AbortController()
+  const result = expect(apiClient.post('/api/tasks', {}, { signal: abort.signal })).rejects.toMatchObject({ code: 'REQUEST_CANCELLED' })
+  abort.abort(); await result; reserve('late-reservation')
+  await vi.waitFor(() => expect(hostInvoke).toHaveBeenCalledWith('core_request_cancel', { requestId: 'late-reservation' }))
+  expect(hostInvoke.mock.calls.some(([command]) => command === 'core_request')).toBe(false)
+})
+it('propagates native deadline errors even when the browser timer has not fired', async () => {
+  hostInvoke.mockImplementation(command => command === 'core_request_prepare' ? Promise.resolve('reservation') : command === 'core_request' ? Promise.reject({code:'REQUEST_TIMEOUT'}) : Promise.resolve())
+  await expect(apiClient.get('/api/status')).rejects.toMatchObject({code:'REQUEST_TIMEOUT'})
+})
+it('dispatches the frozen request envelope and clears its deadline after success', async () => {
+  vi.useFakeTimers()
+  hostInvoke.mockImplementation(command => Promise.resolve(command === 'core_request_prepare' ? 'reservation' : {status:200,content_type:'application/json',body:'{"ok":true}'}))
+  expect(await apiClient.post('/api/tasks', {title:'fixture'}, {token:'not-forwarded'})).toEqual({ok:true})
+  expect(hostInvoke).toHaveBeenCalledWith('core_request', {request: expect.objectContaining({requestId:'reservation',method:'POST',path:'/api/tasks',body:{title:'fixture'}})})
+  expect(JSON.stringify(hostInvoke.mock.calls)).not.toContain('not-forwarded')
+  expect(vi.getTimerCount()).toBe(0)
+})
+it('retains binary bytes and media type through the cancellable transport', async () => {
+  hostInvoke.mockImplementation(command => Promise.resolve(command === 'core_request_prepare' ? 'reservation' : {status:200,content_type:'application/json',body:'{}'}))
+  await apiClient.postBinary('/api/packages',new Blob([new Uint8Array([0,255,128])]))
+  expect(hostInvoke).toHaveBeenCalledWith('core_request', {request: expect.objectContaining({requestId:'reservation',bodyBase64:'AP+A',contentType:'application/zip'})})
+})

frontend/src/services/apiClient.desktop.spec.ts

@@ -6,7 +6,10 @@ vi.mock('./platform/desktop', () => ({ isDesktop: () => true, hostInvoke }))
 
 import apiClient from './apiClient'
 
-beforeEach(() => hostInvoke.mockReset())
+beforeEach(() => {
+  hostInvoke.mockReset()
+  hostInvoke.mockResolvedValueOnce('test-reservation')
+})
 
 it('restores binary desktop responses as browser-compatible response objects', async () => {
   hostInvoke.mockResolvedValue({

frontend/src/services/apiClient.ts

@@ -1,5 +1,6 @@
 import type { ApiError, ErrorResponse } from '@/contracts'
-import { hostInvoke, isDesktop } from './platform/desktop'
+import { isDesktop } from './platform/desktop'
+import { coreRequest, type RequestProgress } from './platform/coreRequest'
 
 // 所有 HTTP 请求都经过此边界，以统一地址、请求追踪和错误契约。
 const BASE_URL = import.meta.env.VITE_API_BASE_URL ?? import.meta.env.VITE_API_BASE ?? ''
@@ -50,12 +51,18 @@ export class ApiErrorClass extends Error {
 
 async function request<T>(path: string, options: RequestOptions = {}): Promise<T> {
   const { params, token, headers, timeoutMs, ...rest } = options
-  const controller = timeoutMs ? new AbortController() : null
+  const desktop = isDesktop()
+  const deadlineMs = timeoutMs ?? (desktop ? 30_000 : undefined)
+  if (deadlineMs !== undefined && (!Number.isFinite(deadlineMs) || deadlineMs <= 0 || (desktop && deadlineMs > 600_000))) {
+    throw new ApiErrorClass('CORE_TIMEOUT_INVALID', '请求超时设置无效')
+  }
+  const controller = new AbortController()
+  const progress: RequestProgress = { issued: false }
   let timedOut = false
-  const abort = () => controller?.abort()
+  const abort = () => controller.abort()
   if (rest.signal?.aborted) abort()
   rest.signal?.addEventListener('abort', abort, { once: true })
-  const timer = timeoutMs ? setTimeout(() => { timedOut = true; controller?.abort() }, timeoutMs) : undefined
+  const timer = deadlineMs ? setTimeout(() => { timedOut = true; controller.abort() }, deadlineMs) : undefined
 
   let url = resolveApiUrl(path)
 
@@ -81,7 +88,8 @@ async function request<T>(path: string, options: RequestOptions = {}): Promise<T
   reqHeaders['X-Request-Id'] = reqId
 
   try {
-    if (isDesktop()) {
+    controller.signal.throwIfAborted()
+    if (desktop) {
       const parsed = new URL(url, 'http://localhost')
       let bodyBase64: string | undefined
       if (rest.body instanceof Blob) {
@@ -91,14 +99,14 @@ async function request<T>(path: string, options: RequestOptions = {}): Promise<T
         for (let offset = 0; offset < bytes.length; offset += 16384) parts.push(String.fromCharCode(...bytes.subarray(offset, offset + 16384)))
         bodyBase64 = btoa(parts.join(''))
       }
-      const response = await hostInvoke<DesktopCoreResponse>('core_request', {
+      const response = await coreRequest<DesktopCoreResponse>({
         method: rest.method ?? 'GET',
         path: `${parsed.pathname}${parsed.search}`,
         body: typeof rest.body === 'string' ? JSON.parse(rest.body) : undefined,
         bodyBase64,
         contentType: new Headers(reqHeaders).get('Content-Type'),
         idempotencyKey: new Headers(reqHeaders).get('Idempotency-Key') ?? undefined,
-      })
+      }, controller.signal, Math.ceil(deadlineMs!), progress)
       if (response.status >= 200 && response.status < 300) {
         if (response.status === 204) return undefined as T
         return (response.content_type.includes('application/json')
@@ -111,7 +119,7 @@ async function request<T>(path: string, options: RequestOptions = {}): Promise<T
     }
     const resp = await fetch(url, {
       ...rest,
-      signal: controller?.signal ?? rest.signal,
+      signal: controller.signal,
       headers: reqHeaders,
     })
 
@@ -136,7 +144,11 @@ async function request<T>(path: string, options: RequestOptions = {}): Promise<T
 
     throw new ApiErrorClass(code, message, details)
   } catch (e) {
-    if (timedOut) throw new ApiErrorClass('REQUEST_TIMEOUT', '请求超时，请检查后端状态后重试。')
+    const nativeCode = (e as { code?: string })?.code
+    const uncertain = desktop && progress.issued && !['GET', 'HEAD'].includes(rest.method ?? 'GET')
+    const details = desktop ? { request_id: progress.requestId, outcome: progress.issued ? 'unknown' : 'not_sent' } : undefined
+    if (timedOut || nativeCode === 'REQUEST_TIMEOUT') throw new ApiErrorClass('REQUEST_TIMEOUT', uncertain ? '请求超时，变更可能已提交，请先检查结果。' : '请求超时，请检查连接。', details)
+    if (controller.signal.aborted || nativeCode === 'REQUEST_CANCELLED') throw new ApiErrorClass('REQUEST_CANCELLED', uncertain ? '请求已取消，变更可能已提交，请先检查结果。' : '请求已取消。', details)
     if (e instanceof ApiErrorClass) throw e
     throw new ApiErrorClass('NETWORK_ERROR', (e as Error).message || 'Network error')
   } finally {

frontend/src/services/platform/coreRequest.ts

@@ -0,0 +1,39 @@
+import { hostInvoke } from './desktop'
+
+export interface RequestProgress { issued: boolean; requestId?: string }
+
+/** A reservation makes cancel-before-dispatch definitive even across IPC ordering. */
+export function coreRequest<T>(args: Record<string, unknown>, signal: AbortSignal, timeoutMs: number, progress: RequestProgress): Promise<T> {
+  return new Promise((resolve, reject) => {
+    let settled = false
+    let requestId: string | undefined
+    const cancel = () => {
+      if (requestId) void hostInvoke('core_request_cancel', { requestId }).catch(() => {})
+    }
+    const abort = () => {
+      if (settled) return
+      settled = true
+      signal.removeEventListener('abort', abort)
+      cancel()
+      reject(new DOMException('Request aborted', 'AbortError'))
+    }
+    if (signal.aborted) { abort(); return }
+    signal.addEventListener('abort', abort, { once: true })
+    void (async () => {
+      try {
+        requestId = await hostInvoke<string>('core_request_prepare', { timeoutMs })
+        progress.requestId = requestId
+        if (settled || signal.aborted) { cancel(); return }
+        progress.issued = true
+        const result = await hostInvoke<T>('core_request', { request: { ...args, requestId } })
+        if (!settled) { settled = true; resolve(result) }
+      } catch (error) {
+        if (!settled) { settled = true; reject(error) }
+      } finally {
+        signal.removeEventListener('abort', abort)
+        // Also discard a reservation if dispatch failed before Rust claimed it.
+        cancel()
+      }
+    })()
+  })
+}