feat: v2.5.12 — plan and quota for every AI tool, Grok Build and Kimi Code, Quit AgentHub (#65)

Usage panel (status bar):
- every account shows its plan (Claude subscriptionType, Codex
  chatgpt_plan_type, Cursor membershipType, Grok subscriptionTier)
- new quota rows: Cursor CLI (cursor.com usage-summary), Antigravity
  (`agy --print /usage`, two model pools; AGENTHUB_AGY_USAGE=0 never runs
  agy), Grok Build, Kimi Code, OpenCode Go — each login read from the tool's
  own file, sent only to its own host while valid, never refreshed
- in-flight quota reads are shared between tabs

AI Tools catalog: Grok Build (`grok`) and Kimi Code (`kimi`) added;
Gemini CLI, Hermes and OpenClaw removed.

Also: Quit AgentHub (#65, `agenthub stop`), status-area icon, Add to Chat
on an editor selection, Settings in three groups, JetBrains-style Changes
panel (ticked files/hunks, ignore, blame, file history), terminal font.

--no-verify: :3000 is taken by another dev server (lane-detect tests);
both suites run by hand — server 2636/2639 (the 3 are :3000), client
1131/1131.

docs/CLI.md

@@ -99,7 +99,9 @@ The CLI talks to the local dashboard server — **API-backed commands require it
 | Command | Description |
 | ------- | ----------- |
 | `agenthub status` | At-a-glance up/down indicator (`●` running / `○` not running); exits `1` when down |
-| `agenthub start [--port N]` | Start the production server **in the background** (detached; survives closing the terminal), wait up to 30 s for `/api/health`, print the URL + PID and the `kill <pid>` stop command. Logs append to `data/agenthub-server.log`. No-ops with a pointer when a server is already up. Requires a built client (`npm run build` once) |
+| `agenthub start [--port N]` | Start the production server **in the background** (detached; survives closing the terminal), wait up to 30 s for `/api/health`, print the URL + PID and the `agenthub stop` hint. Logs append to `data/agenthub-server.log`. No-ops with a pointer when a server is already up. Requires a built client (`npm run build` once). Always ends a Quit (`agenthub stop`); in a plugin install it starts the server the way a session does — by running `scripts/plugin-bootstrap.js` |
+| `agenthub stop` | **Quit AgentHub** (issue #65): closes every workspace terminal (`agenthub-lane-*` tmux sessions — running agents stop), stops the server — through `systemctl --user stop` / `launchctl bootout` when the autostart unit runs it — and keeps it stopped: Claude Code's `SessionStart` bootstrap starts no server while `<data dir>/runtime/stopped` exists. `agenthub start` (or any server starting, e.g. a boot/login with autostart on) clears it. With the server already down it only sets the flag |
+| `agenthub tray` | Show AgentHub's **status-area icon** now, in the foreground (`scripts/tray.js`): Open AgentHub, Quit AgentHub (a submenu asks again, then runs `agenthub stop`), Start AgentHub after a quit (`agenthub start`), Hide this icon. A production server already keeps the icon up on its own unless Settings → System turned it off; this command does not change that setting. Exits at once when an icon is already running |
 | `agenthub repl` (aliases `shell`, `i`) | Open the **interactive shell** — see [Interactive REPL](#interactive-repl) |
 | `agenthub server setup [--hostname name] [--admin name]` | Turn **server mode** on (logins for a shared dashboard): writes `AGENTHUB_MODE=server` (and `DASHBOARD_ALLOWED_HOSTS`) to the settings file and creates the first admin, asking for its password. Works with the server down; restart it afterwards. See [SERVER-MODE.md](SERVER-MODE.md) |
 | `agenthub server off` / `agenthub server status` | Back to local mode (accounts kept) / show the mode and account count |