## What happened

`omarchy-menu-keybindings` spawns a `lua` subprocess that hangs in an infinite loop, pegging a CPU core at ~100%. Each invocation leaks a new stuck `lua` process that never exits, so they accumulate until the machine is hammered (6 stuck processes = ~600% CPU on an 8-core laptop, load average ~9.6).

## Root cause

The `noop` stub in `/usr/share/omarchy/bin/omarchy-menu-keybindings` is iterable, so `ipairs()`/`pairs()` over it never terminate:

```lua
local noop
noop = setmetatable({}, {
  __index = function()
    return noop
  end,
  __call = function()
    return noop
  end,
})
```

Because `__index` returns `noop` for *every* key (including numeric keys), `noop[1]`, `noop[2]`, … are all non-nil. Any `for _, v in ipairs(noop)` loops forever.

The trigger is `~/.config/hypr/looknfeel.lua`'s `update_scrolling_column_width()`, which does:

```lua
for _, monitor in ipairs(hl.get_monitors()) do
```

In the keybindings scan, `hl` is a stub whose `__index` returns `noop`, so `hl.get_monitors()` returns `noop`, and `ipairs(noop)` never ends.

## Steps to reproduce

1. Have a `~/.config/hypr/looknfeel.lua` that calls `hl.get_monitors()` (e.g. the scrolling `column_width` auto-adjust pattern).
2. Run `omarchy menu keybindings` (or trigger the keybindings menu).
3. Observe a `lua` child of `omarchy-menu-keybindings` spin at ~100% CPU and never exit.

Minimal repro of the core bug:

```lua
local noop
noop = setmetatable({}, {
  __index = function() return noop end,
  __call  = function() return noop end,
})
for _ in ipairs(noop) do end  -- never terminates
```

## Expected behavior

The keybindings scan should complete quickly and the `lua` subprocess should exit.

## Suggested fix

Make the `noop` stub non-iterable by returning `nil` for numeric keys:

```lua
noop = setmetatable({}, {
  __index = function(_, k)
    if type(k) == "number" then return nil end
    return noop
  end,
  __call = function() return noop end,
})
```

I verified this fix locally: with `get_monitors = function() return {} end` (or the non-iterable `noop`), the full config loads cleanly in under a second.

## System details

- Omarchy 4.0.2-1
- Hyprland 0.56.2
- Arch Linux, 8-core laptop