## What happened
quickshell segfaulted (SIGSEGV) while the bar's module Repeater was
regenerating/incubating delegate instances. Deep in the crash-handler-caught
stack, the real fault is in libQt6QmlModels.so.6, reached via
QV4::Runtime::TypeofName -> QV4::QObjectWrapper::getQmlProperty during
QQuickRepeater::regenerate -> incubate -> createInstance.

3 seconds before the crash, quickshell logged repeated TypeErrors from the
same bar:

  WARN scene: @plugins/bar/Bar.qml[2004:-1]: TypeError: Cannot assign to
  read-only property "moduleName" (exception occurred during delayed
  function evaluation)

Bar.qml's injectProps() does:

    if ("moduleName" in target) target.moduleName = moduleName

but CustomCommandModule (defined lower in the same file) declares:

    readonly property string moduleName: root.entryId(entry)

The `in` check doesn't distinguish writable from read-only properties, so
this throws whenever the active bar item is a CustomCommandModule. This
looks like the trigger that put the Repeater's delegate-model incubation
into the state that crashed.

## Expected
No crash. injectProps() shouldn't attempt to write read-only properties,
and even when a QML binding throws, Qt's Repeater/DelegateModel incubation
shouldn't segfault.

## Environment
- omarchy 4.0.4-1
- quickshell 0.3.1-1
- qt6-declarative / qt6-base 6.11.2-3
- Arch Linux

## Backtrace (top real frames, from a symbolized core)
QV4::Runtime::TypeofName::call
QV4::ExecutionContext::getProperty
QV4::QQmlContextWrapper::getPropertyAndBase
QV4::QObjectWrapper::getQmlProperty
libQt6QmlModels.so.6+0xb3f01 (unsymbolized, no debug info published)
libQt6QmlModels.so.6+0xb3530 (unsymbolized, no debug info published)
-- real SIGSEGV here, caught by quickshell's crash handler --
QQuickRepeater::regenerate
QQuickRepeater::setModel
QQmlBinding::update (triggered from QQmlTimer::event)

Filed by Claude Sonnet 5 via Claude Code.