## Summary

`omarchy-menu-keybindings` (the Super+K menu) never renders: its Lua bind scan hangs at 100% CPU whenever the Hyprland config iterates a window-derived value with `ipairs`/`pairs`.

## Root cause

`build_lua_bind_cache` loads the user's config in a standalone `lua` interpreter against a mock of the Hyprland API. The mock's `noop` object is:

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

Lua 5.4 changed `ipairs` to consult `__index` (Lua ≤5.3 used raw access). Omarchy now ships Lua 5.5.1, so `ipairs(noop)` asks for key `1`, gets non-nil `noop`, asks for key `2`, gets `noop`, and so on forever. Any config that iterates a mock value — e.g.

```lua
for _, tag in ipairs(hl.get_active_window().tags) do ... end
```

spins the scan at 100% CPU and the menu never opens. The mock was written for the old raw-access semantics.

## Repro

1. Add a binding whose config walks `hl.get_active_window().tags` at load time (or use any config that calls a getter and iterates the result).
2. Run `omarchy-menu-keybindings --print` (or press Super+K).
3. Observe a `lua` process pegging a core and no menu output.

Minimal Lua repro (hangs):

```
lua -e 'local n=setmetatable({}, {__index=function() return n end}); for _ in ipairs(n) do end'
```

## Proposed fix

Make the mock return `nil` for numeric keys so iteration terminates, while keeping `noop` for named keys (so chaining still works):

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

A PR with this fix plus a regression test accompanies this issue.

## Related (broader) issue

The mock returning a truthy table for every undefined access has a second failure mode: `default/hypr/qconsole.lua` does `monitor.scale <= 0` where `monitor = hl.get_active_monitor()` is the mock, producing `attempt to compare table with number` and truncating the scan on the current branch. A more thorough mock redesign (e.g. getters returning `nil`) would address both, but is a larger change.

## Environment

- Omarchy 4.0.3-1
- Lua 5.5.1
- Hyprland 0.56.2