refactor(web): remove --dev; mount the reload chain unconditionally

The client-hmr row joins the web bundle as an ordinary always-on roster
row: without a rebuild watcher rewriting client bundles it polls
unchanged files and stays idle. This deletes the --dev flag, the web
runtime's mode config, the mode-forked prompt contract, the DSH_WEB_MODE
bash variable, and the post-settlement row-creation machinery the
conditional row required. dsh web + pnpm run dev:web remains the
development loop.

apps/cli/reference/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write apps/cli/reference/README.md
-README.md: 8a38677868f85d4a5b24376a96f0e336c13fa89c
-README.zh.md: c0ee1a5fabb8eec6bd34a8a386b2e2409d570e55
+README.md: 46ea3c241d6775ce90a89c7be58901375a0634a3
+README.zh.md: f020f46260d6b04b87a4918a671ca6bcbed251d9

apps/cli/reference/README.md

@@ -24,7 +24,7 @@ The shipped apps own these command lines:
 
 | Profile | Arguments |
 |---|---|
-| `web` | `--host`, `--port`, `--dev`, repeatable `--trusted-host` |
+| `web` | `--host`, `--port`, repeatable `--trusted-host` |
 | `headless` | the task text, as the positional argument |
 
 A one-shot task (`dsh --profile headless "run the tests"`) creates one fresh persisted Agent through the core registry, submits the task, waits for quiescence, and flushes the Session before deriving the last non-empty assistant text and final `turn/end` reason from its durable interval. It prints the text on stdout and exits 0 for `completed`, else 1. An invocation with no task is a usage error from that app. The shipped headless profile mounts no ApiProxy, Host, HTTP server, Web runtime, or browser client; a successful run writes nothing to stderr and opens no listening port.
@@ -52,7 +52,7 @@ Git-hosted plugins that ship sources build during install through their `prepare
 
 ## Web alias
 
-`dsh web` is a hardcoded alias for `--profile web`; the flags after it belong to the web app, whose ordinary bundle provider parses them. `--host` and `--port` override the composed values of the rows that carry them, repeatable `--trusted-host` contributes invocation authorities through `ctx.webRuntime.trustedHosts` (a deployment expression concatenates its own authorities), and `--dev` switches the web-runtime row to development mode, which mounts the client-plugin HMR receiver row after Loader settlement; it expects a separate `pnpm run dev:web` watcher for no-refresh client bundle updates.
+`dsh web` is a hardcoded alias for `--profile web`; the flags after it belong to the web app, whose ordinary bundle provider parses them. `--host` and `--port` override the composed values of the rows that carry them, and repeatable `--trusted-host` contributes invocation authorities through `ctx.webRuntime.trustedHosts` (a deployment expression concatenates its own authorities). The client-plugin HMR receiver is always mounted and stays idle until a separate `pnpm run dev:web` watcher rebuilds client bundles.
 
 ```sh
 dsh web

apps/cli/reference/README.zh.md

@@ -24,7 +24,7 @@
 
 | Profile | 参数 |
 |---|---|
-| `web` | `--host`、`--port`、`--dev`、可重复的 `--trusted-host` |
+| `web` | `--host`、`--port`、可重复的 `--trusted-host` |
 | `headless` | 任务文本，作为位置参数 |
 
 一次性任务（`dsh --profile headless "run the tests"`）通过核心注册表创建一个全新的持久化 Agent（智能体），提交任务、等待完全停稳并对 Session 执行 flush，再从其持久化事件区间中推导最后一个非空 assistant 文本与最终 `turn/end` 原因。它在 stdout 打印文本，并在原因为 `completed` 时以 0 退出，否则以 1 退出。没有任务的调用是该应用的用法错误。随附 headless profile 不挂载 ApiProxy、Host、HTTP 服务器、Web 运行时或浏览器客户端；成功运行不会向 stderr 写入任何内容，也不会打开监听端口。
@@ -52,7 +52,7 @@ Git 托管、随附源码的插件在安装期间通过其 `prepare` 脚本构
 
 ## Web 别名
 
-`dsh web` 是 `--profile web` 的硬编码别名；写在它之后的 flag 属于 web 应用，由组合包中的普通提供方解析。`--host` 和 `--port` 覆盖承载它们的那些行的组合取值，可重复的 `--trusted-host` 通过 `ctx.webRuntime.trustedHosts` 提供本次调用的 authority（部署表达式会拼接自己的 authority），`--dev` 把 web-runtime 行切换到开发模式，由其在 Loader 结算后挂载客户端插件 HMR（热模块替换）接收器行；若要无刷新更新客户端 bundle，还需单独运行 `pnpm run dev:web` watcher。
+`dsh web` 是 `--profile web` 的硬编码别名；写在它之后的 flag 属于 web 应用，由组合包中的普通提供方解析。`--host` 和 `--port` 覆盖承载它们的那些行的组合取值，可重复的 `--trusted-host` 通过 `ctx.webRuntime.trustedHosts` 提供本次调用的 authority（部署表达式会拼接自己的 authority），客户端插件 HMR（热模块替换）接收器始终挂载，在单独运行的 `pnpm run dev:web` watcher 重建客户端 bundle 之前保持空闲。
 
 ```sh
 dsh web