docs(readme,cli): document /new & zero upgrade, add Discord link, and sync help text

README.md

@@ -8,6 +8,7 @@
   <a href="LICENSE"><img alt="license" src="https://img.shields.io/badge/license-MIT-blue"></a>
   <img alt="Go 1.26.5+" src="https://img.shields.io/badge/Go-1.26.5+-00ADD8?logo=go&logoColor=white">
   <img alt="25+ providers" src="https://img.shields.io/badge/providers-25+-34E2EA">
+  <a href="https://discord.gg/CaQDS6wdFn"><img alt="Discord" src="https://img.shields.io/badge/Discord-join-5865F2?logo=discord&logoColor=white"></a>
   <br>
   <strong>English</strong> | <a href="README_ZH.md">中文</a>
 </p>
@@ -205,6 +206,7 @@ Common slash commands:
 | `/spec`, `/plan` | draft and review a plan before building |
 | `/image` | attach an image for vision-capable models |
 | `/resume`, `/rewind` | continue or roll back local sessions |
+| `/new` | start a fresh session in place (previous session stays on disk) |
 | `/btw [question]` | ask in an isolated fork without adding the side conversation to the main session |
 | `/loop` | repeat a prompt or custom `/command` on an interval (`/loop 5m /babysit-prs`) or self-paced |
 | `/compact`, `/context` | manage context usage |
@@ -301,7 +303,8 @@ zero verify           detect and run local verification checks
 zero changes          inspect and commit local git changes
 zero usage            token usage and estimated cost
 zero cron             scheduled agent jobs
-zero update           check for newer releases
+zero update --check   check for newer releases
+zero upgrade          download, verify, and install the latest release
 ```
 
 ## Extending Zero
@@ -408,6 +411,8 @@ go run ./cmd/zero-release build --goos windows --goarch amd64 --output dist/zero
 
 ## Community
 
+Real-time chat happens on the [Discord server](https://discord.gg/CaQDS6wdFn).
+
 Questions, setup help, ideas, and sharing all live in
 [GitHub Discussions](https://github.com/Gitlawb/zero/discussions):
 

README_ZH.md

@@ -8,6 +8,7 @@
   <a href="LICENSE"><img alt="license" src="https://img.shields.io/badge/license-MIT-blue"></a>
   <img alt="Go 1.26.5+" src="https://img.shields.io/badge/Go-1.26.5+-00ADD8?logo=go&logoColor=white">
   <img alt="25+ providers" src="https://img.shields.io/badge/providers-25+-34E2EA">
+  <a href="https://discord.gg/CaQDS6wdFn"><img alt="Discord" src="https://img.shields.io/badge/Discord-join-5865F2?logo=discord&logoColor=white"></a>
   <br>
   <a href="README.md">English</a> | <strong>中文</strong>
 </p>
@@ -141,6 +142,7 @@ zero
 | `/spec`、`/plan` | 在构建之前起草和审查计划 |
 | `/image` | 为视觉模型附加图片 |
 | `/resume`、`/rewind` | 继续或回滚本地会话 |
+| `/new` | 原地开始一个新会话（之前的会话仍保留在磁盘上） |
 | `/compact`、`/context` | 管理上下文使用 |
 | `/permissions`、`/tools` | 检查可用工具和策略 |
 | `/add-dir` | 为此会话授予额外的写入目录 |
@@ -226,7 +228,8 @@ zero verify           检测和运行本地验证检查
 zero changes          检查和提交本地 Git 变更
 zero usage            Token 使用量和估算成本
 zero cron             定时智能体任务
-zero update           检查更新版本
+zero update --check   检查更新版本
+zero upgrade          下载、验证并安装最新版本
 ```
 
 ## 外观和无障碍
@@ -269,6 +272,20 @@ go run ./cmd/zero-release build --goos windows --goarch amd64 --output dist/zero
 - [性能](docs/PERFORMANCE.md)
 - [智能体评估](docs/AGENT_EVALS.md)
 
+## 社区
+
+实时交流在 [Discord 服务器](https://discord.gg/CaQDS6wdFn) 进行。
+
+提问、安装帮助、想法和分享都在
+[GitHub Discussions](https://github.com/Gitlawb/zero/discussions)：
+
+| 分类 | 用途 |
+|---|---|
+| [Q&A](https://github.com/Gitlawb/zero/discussions/categories/q-a) | 安装帮助、提供商/模型配置、"如何做"类问题 |
+| [Ideas](https://github.com/Gitlawb/zero/discussions/categories/ideas) | 功能提议和 PR 之前的设计讨论 |
+| [Show and tell](https://github.com/Gitlawb/zero/discussions/categories/show-and-tell) | 你的技能、插件、MCP 配置、主题和工作流 |
+| [Announcements](https://github.com/Gitlawb/zero/discussions/categories/announcements) | 维护者发布的版本和项目动态 |
+
 ## 贡献
 
 欢迎贡献。阅读 [CONTRIBUTING.md](CONTRIBUTING.md)，运行相关测试，然后提交一个聚焦的拉取请求。

docs/INSTALL.md

@@ -234,10 +234,11 @@ directory.
 
 ## Updating
 
-Check for a newer release:
+Check for a newer release, then download, verify, and install it in place:
 
 ```bash
 zero update --check
+zero upgrade
 ```
 
-Then reinstall with npm or rerun the install script for the version you want.
+See the [update guide](UPDATE.md) for update modes, flags, and platform details.

docs/UPDATE.md

@@ -1,16 +1,23 @@
 # Update Flow
 
 `zero update --check` checks the latest GitHub release and compares it with the
-local CLI version.
+local CLI version. `zero update --apply` (or its shorthand, `zero upgrade`)
+downloads, verifies, and installs it.
 
 ```bash
 zero update --check
 zero update --check --json
 zero update --check --repo Gitlawb/zero
 zero update --check --target windows-x64
+
+zero upgrade
+zero update --apply
 ```
 
-The command is intentionally check-only:
+`--check` and `--apply` are mutually exclusive. `zero update` requires one of
+them explicitly; `zero upgrade` is `zero update` with `--apply` implied.
+
+`--check` is check-only:
 
 - It does not replace the running binary.
 - It exits with code `0` when the check succeeds, even when an update is
@@ -19,14 +26,35 @@ The command is intentionally check-only:
 - `--json` prints the same result in a machine-readable format for scripts and
   CI.
 
+`--apply` installs the update in place:
+
+- npm installs delegate to `npm install -g @gitlawb/zero@latest`.
+- Standalone installs download the release archive, verify its checksum,
+  extract it, and atomically replace the running binary plus any installed
+  optional sandbox helpers.
+- On Windows, the running executable is renamed aside and cleaned up on the
+  next `zero update --apply` or `zero upgrade`, since it can't be overwritten
+  while running.
+- `--target` cannot be combined with `--apply`; it only applies to `--check`,
+  since applying always installs onto the current machine.
+- `--repo` and `--endpoint` are ignored when applying to an npm-managed
+  install: that path delegates to `npm install -g @gitlawb/zero@latest` and
+  takes its release from the npm registry, not from GitHub. They still apply to
+  `--check` there.
+- `--json` serializes Zero's final result. For npm-managed installs, npm may
+  also write progress output to stdout, so neither
+  `zero update --apply --json` nor `zero upgrade --json` is guaranteed to
+  produce a single parseable JSON document. Use `--check --json` for
+  machine-readable automation.
+
 Useful flags:
 
 | Flag | Purpose |
 |---|---|
-| `--repo <owner/repo>` | Check another GitHub repository. |
-| `--endpoint <url|owner/repo>` | Check a specific release API URL or repository slug. |
+| `--repo <owner/repo>` | Use another GitHub repository for `--check` and `--apply`/`upgrade`. Ignored by an npm-managed apply. |
+| `--endpoint <url\|owner/repo>` | Use a specific release API URL or repository slug for `--check` and `--apply`/`upgrade`. Ignored by an npm-managed apply. |
 | `--timeout <duration>` | Override the default release check timeout. |
-| `--target <platform-arch>` | Validate release metadata for another supported target. |
+| `--target <platform-arch>` | Validate release metadata for another supported target (`--check` only). |
 
 Supported targets are `linux-x64`, `linux-arm64`, `macos-x64`, `macos-arm64`,
 `windows-x64`, and `windows-arm64`. Without `--target`, Zero checks the current
@@ -40,5 +68,5 @@ Endpoint resolution order:
 4. `https://api.github.com/repos/Gitlawb/zero/releases/latest`
 
 Installer scripts download the matching release asset for the local platform and
-verify its `.sha256` file. If Zero is already installed, run `zero update --check`
-before reinstalling.
+verify its `.sha256` file. If Zero is already installed, run `zero upgrade`
+instead of reinstalling.

internal/cli/app.go

@@ -1196,7 +1196,8 @@ Commands:
   mcp        Manage MCP backend settings
   auth       Log in to model providers via OAuth
   sandbox    Inspect sandbox policy and persistent grants
-  update     Check for Zero CLI updates
+  update     Check or apply Zero CLI updates (requires --check or --apply)
+  upgrade    Download, verify, and install available Zero CLI updates
   worktrees  Prepare isolated git worktrees
   verify     Detect and run local verification checks
   eval       Validate offline agent eval suites

internal/cli/app_test.go

@@ -1457,6 +1457,20 @@ func TestRunUpdateHelpDocumentsCheckFlag(t *testing.T) {
 	}
 }
 
+func TestTopLevelHelpDocumentsRequiredUpdateMode(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	exitCode := runWithDeps([]string{"--help"}, &stdout, &stderr, appDeps{})
+
+	if exitCode != exitSuccess {
+		t.Fatalf("expected exit code %d, got %d: %s", exitSuccess, exitCode, stderr.String())
+	}
+	if got := stdout.String(); !strings.Contains(got, "update     Check or apply Zero CLI updates (requires --check or --apply)") {
+		t.Fatalf("expected top-level help to document required update mode, got %q", got)
+	}
+}
+
 func TestRunUpdateReportsUpToDate(t *testing.T) {
 	var stdout bytes.Buffer
 	var stderr bytes.Buffer
@@ -1660,6 +1674,7 @@ func assertHelpOutput(t *testing.T, args []string) {
 		"mcp",
 		"sandbox",
 		"update",
+		"upgrade",
 		"worktrees",
 		"verify",
 		"serve",

internal/cli/update.go

@@ -202,8 +202,8 @@ Flags:
       --check                 Check the latest GitHub release without installing
       --apply                 Download, verify, and install the latest release
       --json                  Print the update result as JSON
-      --repo <owner/repo>     Repository to check when no endpoint is provided
-      --endpoint <url|repo>   Release API URL or owner/repo slug to check
+      --repo <owner/repo>     Repository to use when no endpoint is provided (--check and --apply; ignored for the install source by an npm-managed apply)
+      --endpoint <url|repo>   Release API URL or owner/repo slug to use (--check and --apply; ignored for the install source by an npm-managed apply)
       --timeout <duration>    Release check timeout (default 5s)
       --target <platform>     Release target to verify with --check (for example windows-x64); not valid with --apply
   -h, --help                  Show this help

internal/update/installmethod.go

@@ -33,12 +33,19 @@ func DetectInstallMethod(executablePath string) InstallMethod {
 		return InstallMethodStandalone
 	}
 	var pkg struct {
-		Name string `json:"name"`
+		Name string          `json:"name"`
+		OS   []string        `json:"os"`
+		CPU  []string        `json:"cpu"`
+		Bin  json.RawMessage `json:"bin"`
 	}
 	if err := json.Unmarshal(data, &pkg); err != nil {
 		return InstallMethodStandalone
 	}
-	if pkg.Name == npmPackageName {
+	// The native platform package is inert and constrained to one OS/CPU. The
+	// repository's wrapper package has the same name but carries a bin entry and
+	// broad platform lists, so name alone would misclassify `go build -o zero`
+	// from the repository root as an npm-managed install.
+	if pkg.Name == npmPackageName && len(pkg.OS) == 1 && len(pkg.CPU) == 1 && len(pkg.Bin) == 0 {
 		return InstallMethodNpm
 	}
 	return InstallMethodStandalone

internal/update/installmethod_test.go

@@ -37,14 +37,29 @@ func TestDetectInstallMethodNpmViaPackageJSON(t *testing.T) {
 	if err := os.WriteFile(exePath, []byte("binary"), 0o755); err != nil {
 		t.Fatalf("WriteFile: %v", err)
 	}
-	if err := os.WriteFile(filepath.Join(dir, "package.json"), []byte(`{"name":"@gitlawb/zero"}`), 0o644); err != nil {
+	if err := os.WriteFile(filepath.Join(dir, "package.json"), []byte(`{"name":"@gitlawb/zero","version":"0.5.0-linux-x64","os":["linux"],"cpu":["x64"]}`), 0o644); err != nil {
 		t.Fatalf("WriteFile package.json: %v", err)
 	}
 	if method := DetectInstallMethod(exePath); method != InstallMethodNpm {
 		t.Fatalf("DetectInstallMethod = %q, want npm", method)
 	}
 }
 
+func TestDetectInstallMethodDoesNotTreatRepositoryManifestAsNpmBinary(t *testing.T) {
+	dir := t.TempDir()
+	exePath := filepath.Join(dir, "zero")
+	if err := os.WriteFile(exePath, []byte("binary"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	manifest := `{"name":"@gitlawb/zero","bin":{"zero":"bin/zero.js"},"os":["linux","darwin","win32","android"],"cpu":["x64","arm64"]}`
+	if err := os.WriteFile(filepath.Join(dir, "package.json"), []byte(manifest), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if method := DetectInstallMethod(exePath); method != InstallMethodStandalone {
+		t.Fatalf("DetectInstallMethod = %q, want standalone for repository wrapper manifest", method)
+	}
+}
+
 func TestDetectInstallMethodIgnoresUnrelatedPackageJSON(t *testing.T) {
 	dir := t.TempDir()
 	exePath := filepath.Join(dir, "zero")