docs: add resume and list commands to README

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: dorlugasigal

README.md

@@ -90,6 +90,8 @@ termbeam --port 8080              # custom port (default: 3456)
 termbeam --host 0.0.0.0           # allow LAN access (default: 127.0.0.1)
 termbeam --lan                    # shortcut for --host 0.0.0.0
 termbeam -i                       # interactive setup wizard
+termbeam resume [name]            # reconnect to a running session from another terminal
+termbeam list                     # list active sessions on the running server
 termbeam service install          # interactive PM2 service setup wizard
 termbeam service uninstall        # stop & remove PM2 service
 termbeam service status           # show PM2 service status
@@ -115,13 +117,15 @@ termbeam service restart          # restart PM2 service
 | `-h, --help`          | Show help                                            | —              |
 | `-v, --version`       | Show version                                         | —              |
 
-| Subcommand          | Description                   |
-| ------------------- | ----------------------------- |
-| `service install`   | Interactive PM2 service setup |
-| `service uninstall` | Stop & remove from PM2        |
-| `service status`    | Show PM2 service status       |
-| `service logs`      | Tail PM2 service logs         |
-| `service restart`   | Restart PM2 service           |
+| Subcommand          | Description                                       |
+| ------------------- | ------------------------------------------------- |
+| `resume [name]`     | Attach to a running session from another terminal |
+| `list`              | List active sessions on the running server        |
+| `service install`   | Interactive PM2 service setup                     |
+| `service uninstall` | Stop & remove from PM2                            |
+| `service status`    | Show PM2 service status                           |
+| `service logs`      | Tail PM2 service logs                             |
+| `service restart`   | Restart PM2 service                               |
 
 Environment variables: `PORT`, `TERMBEAM_PASSWORD`, `TERMBEAM_CWD`, `TERMBEAM_LOG_LEVEL`, `SHELL` (Unix fallback), `COMSPEC` (Windows fallback). See [Configuration docs](https://dorlugasigal.github.io/TermBeam/configuration/).