feat(omo): notify this Mac about omo sessions on flowstate-remote

mosh drops the OSC 777 banner that omo-notify posts, so omo sessions on the server only reached the phone through ntfy. The server's omo-notify now writes the session state into its tmux client's terminal title (omo:<state>:<time>:<project>), which mosh and ssh carry. A pane-title-changed hook hands it to the new omo-remote, which runs omo-notify for the local mosh pane through the new OMO_NOTIFY_PANE override, so remote sessions get the same sound, tab marker and banner as local ones.

Sessions that no terminal is showing come through ntfy instead: omo-remote install starts a launchd agent running ntfy subscribe, which plays the sound and posts the banner for omo pushes the server did not tag attached. Brewfile gains ntfy; the token lives in ~/.config/ntfy/omo-remote.env, outside the repository.

README.md

@@ -229,6 +229,7 @@ Custom scripts and binaries are stored in `.local/bin/`:
 - `tmux-open-path`: Backs tmux's Ctrl+click. Takes the path under the mouse, strips `:line:col`, `#L10`, `@` and `file://`, resolves it against the pane's directory and then its git root, and routes it by type: markdown to Markdown Preview (`cask "markdown-preview"` in `Brewfile.apps`), images, PDFs and directories to yazi, the rest to nvim
 - `omo-notify`: Sound, tab marker and notification for OmO's hooks. Ghostty posts the notification, so clicking it opens the session's tab and pane
 - `omo-status`: Coloured marker in front of the Ghostty tab title for each tmux session running omo: 🔴 stopped with an error, 🟡 waiting for your answer, 🟢 finished, 🔵 working. A tab with several agents shows the most urgent one; focusing the tab clears red, amber and green, and undoes any title you gave the tab by hand so it always shows its session name
+- `omo-remote`: The same sound, tab marker and notification for omo sessions on a remote server (flowstate-remote). The server's `omo-notify` (kept on the server in `~/.local/bin`, not in this repository) writes the session's state into its terminal title as `omo:<state>:...`. mosh drops notifications but carries titles, and so does ssh, so tmux's `pane-title-changed` hook passes the event to `omo-notify` for the pane running mosh or ssh. A session that no terminal is showing reaches you through ntfy instead: `omo-remote install` starts a launchd agent that subscribes to the topic and plays the sound and posts the notification for omo pushes. The server tags a push `attached` when the title already reached a terminal, and the agent skips those so nothing arrives twice. The agent reads `NTFY_URL`, `NTFY_TOPIC` and `NTFY_TOKEN` from `~/.config/ntfy/omo-remote.env` (chmod 600, not in this repository) and needs `brew "ntfy"`
 - `docker-nuke`: Force-restart a wedged Docker Desktop, capturing diagnostics to `~/.local/state/docker-nuke/` first (`--dry-run` to preview, `--no-restart` to leave it down, `--deep` for root helpers)
 
 The `links` step of `setup-mac.sh` links each script into `~/.local/bin`, which `.zshrc` puts on your PATH. `pbcopy` and `pbpaste` are OSC 52 clipboard shims for headless servers, so they are not linked on macOS.