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`Application::do_run` registers a `composer.json` script whose value names a
`Symfony\Component\Console\Command\Command` subclass as a live command. The
class checks and `new $dummy($script)` need a real PHP runtime, so they run in
the worker: the command object lives there and this side keeps a metadata
mirror for `list`/`help`, forwarding a run to the worker-side console
application it is added to. The name and description fixups are applied to the
worker-side object, so both sides carry the same values.
Loading the Composer PHP runtime into the worker is gated on the Rust-side
`ClassLoader`s resolving the class to a file, keeping that load out of every
run whose scripts are plain shell commands.
The worker-side console application handoff now accepts commands registered
after it was published, since the scripts scan runs after plugin commands are
collected. Whether it was published is tracked per application: the handoff is
process-wide, so a second application must replace it rather than extend it.
`shirabe_php_shim::is_subclass_of` has no callers left.
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