refactor(composer): unify Composer/PartialComposer via Rc handles

Model PHP's `Composer extends PartialComposer` as a PartialOrFullComposer
enum and merge partial_composer.rs into composer.rs. Introduce
ComposerHandle / PartialComposerHandle (plus their Weak variants) so the
graph can be shared, and build it at once with Rc::new_cyclic in the
factory to resolve the back-reference cycles.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/crates/shirabe/src/command/init_command.rs b/crates/shirabe/src/command/init_command.rs
index eb6983f..122642d 100644
--- a/crates/shirabe/src/command/init_command.rs
+++ b/crates/shirabe/src/command/init_command.rs
@@ -19,7 +19,7 @@ use shirabe_php_shim::{
 
 use crate::command::PackageDiscoveryTrait;
 use crate::command::{BaseCommand, BaseCommandData, HasBaseCommandData};
-use crate::composer::Composer;
+use crate::composer::PartialComposerHandle;
 use crate::console::input::InputOption;
 use crate::factory::Factory;
 use crate::io::IOInterface;
@@ -56,7 +56,7 @@ impl PackageDiscoveryTrait for InitCommand {
         todo!()
     }
 
-    fn try_composer(&self) -> Option<Composer> {
+    fn try_composer(&self) -> Option<PartialComposerHandle> {
         todo!()
     }
 
@@ -64,7 +64,7 @@ impl PackageDiscoveryTrait for InitCommand {
         &self,
         disable_plugins: Option<bool>,
         disable_scripts: Option<bool>,
-    ) -> Composer {
+    ) -> PartialComposerHandle {
         todo!()
     }