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.

3 files changed, 66 insertions, 0 deletions

diff --git a/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/GreetCommand.php b/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/GreetCommand.php
new file mode 100644
index 00000000..e797486b
--- /dev/null
+++ b/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/GreetCommand.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace ShirabeTest\ScriptCommand;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class GreetCommand extends Command
+{
+    protected function configure(): void
+    {
+        $this
+            ->setDescription('Greets someone from a script-provided command.')
+            ->setHelp('The <info>greet</info> command exercises a Command class named by a composer.json script.')
+            ->addArgument('who', InputArgument::REQUIRED, 'Who to greet')
+            ->addOption('shout', 's', InputOption::VALUE_NONE, 'Uppercase the greeting');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $message = 'Hello ' . $input->getArgument('who');
+        if ($input->getOption('shout')) {
+            $message = strtoupper($message);
+        }
+        $output->writeln('greet: ' . $message);
+        $output->writeln('greet: name=' . $this->getName());
+        $output->writeln('greet: app=' . get_class($this->getApplication()));
+
+        return 0;
+    }
+}
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;
+    }
+}
diff --git a/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/SingleAppCommand.php b/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/SingleAppCommand.php
new file mode 100644
index 00000000..89e17fe9
--- /dev/null
+++ b/crates/shirabe/tests/plugin/fixtures/e2e-script-command/src/SingleAppCommand.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace ShirabeTest\ScriptCommand;
+
+use Symfony\Component\Console\SingleCommandApplication;
+
+class SingleAppCommand extends SingleCommandApplication
+{
+}