feat(cli): drop streaming run output, emit summary only

CLAUDE.md

@@ -27,7 +27,7 @@ twd-relay is a WebSocket relay that lets AI agents and external tools trigger an
 
 **Vite Plugin** (`src/vite/`, exported as `twd-relay/vite`) — A Vite plugin that hooks into `configureServer` to attach the relay to the dev server's HTTP instance, and (in `apply: 'serve'` mode) auto-injects a `<script type="module">` that imports `createBrowserClient` and calls `.connect()` via a virtual module (`virtual:twd-relay/connect`). Auto-injection is on by default; set `autoConnect: false` to opt out and wire `createBrowserClient` manually (required for non-Vite consumers). Both the relay-server path and the injected client path use the same formula (`options.path ?? base + '/__twd/ws'`); `configResolved` sets the `base` for both.
 
-**CLI** (`src/cli/`, bin: `twd-relay`) — Two subcommands: `serve` (default) starts a standalone HTTP server with the relay on port 9876; `run` connects to an existing relay as a client, sends a `run` command, streams test output, and exits with code 0/1 based on results. The `run` subcommand defaults to port 5173 (Vite dev server) and has a 180s timeout. Use `--test "name"` (repeatable) to filter tests by name substring match.
+**CLI** (`src/cli/`, bin: `twd-relay`) — Two subcommands: `serve` (default) starts a standalone HTTP server with the relay on port 9876; `run` connects to an existing relay as a client, sends a `run` command, stays silent during the run, and prints a single summary block at the end (passed/failed/skipped counts plus failure details) before exiting with code 0/1. The `run` subcommand defaults to port 5173 (Vite dev server) and has a 180s timeout. Use `--test "name"` (repeatable) to filter tests by name substring match. The output format is optimised for AI-agent consumption — every line printed costs context tokens.
 
 ### Message protocol flow