feat(console): import scripts Command classes as application commands

`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.

1 files changed, 23 insertions, 0 deletions

diff --git a/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/MismatchedNameCommand.php b/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/MismatchedNameCommand.php
new file mode 100644
index 00000000..f3f6b05f
--- /dev/null
+++ b/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/MismatchedNameCommand.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace ShirabeTest\ScriptCommand;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class MismatchedNameCommand extends Command
+{
+    protected function configure(): void
+    {
+        $this->setName('not-the-script-name');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $output->writeln('renamed: name=' . $this->getName());
+        $output->writeln('renamed: description=' . $this->getDescription());
+
+        return 0;
+    }
+}