feat(plugin): discover and list plugin-provided commands

Port Application::getPluginCommands: resolve the local composer with
plugins force-enabled, fall back to Factory::createGlobal, and collect
commands from CommandProvider capability adapters. PhpCommandProxy now
mirrors name/description/aliases/hidden over RPC so `list` output
matches upstream; input definitions remain TODO(plugin).

PhpClass::php_class_name returns an owned String because PHP-backed
proxies only know their class at runtime (the override-skip warning
prints get_class). CommandProvider::getCommands hands out shared
Rc<RefCell> handles since the commands are stored in the application.

Factory::createGlobal now propagates createConfig errors instead of
swallowing them, and Application::getComposer only catches the
exception classes upstream catches, so a ParsingException reaches
doRun's GithubActionError path as in Composer.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/crates/shirabe/src/command/base_command.rs b/crates/shirabe/src/command/base_command.rs
index 77850e9e..f9682de9 100644
--- a/crates/shirabe/src/command/base_command.rs
+++ b/crates/shirabe/src/command/base_command.rs
@@ -283,7 +283,7 @@ impl Command for BaseCommandData {
 }
 
 impl PhpClass for BaseCommandData {
-    fn php_class_name(&self) -> &'static str {
+    fn php_class_name(&self) -> String {
         // Forwards to the base state's panicking implementation; concrete commands supply
         // their own class name through `impl_php_class!`.
         self.inner.php_class_name()
@@ -852,7 +852,7 @@ pub fn base_command_initialize(
         crate::factory::DisablePlugins::None
     };
     let composer = if composer.is_none() {
-        Factory::create_global(io.clone(), disable_plugins_kind, disable_scripts)
+        Factory::create_global(io.clone(), disable_plugins_kind, disable_scripts)?
     } else {
         composer
     };