refactor(composer): represent composer via trait-based handlesrefactor/composer-handles

Replace the PartialComposer/Composer structs and the single
Rc<RefCell<PartialOrFullComposer>> enum with PartialComposer and
Composer traits (Composer: PartialComposer), InnerPartialComposer /
InnerFullComposer data structs, and the handle types FullComposerHandle
(impl Composer) and AnyComposerHandle (polymorphic enum, impl
PartialComposer), plus their weak variants.

Factory builds the full and partial graphs via separate Rc::new_cyclic
branches that share a build_composer_base helper. Call sites now use
trait methods that encapsulate borrowing instead of borrow_partial() /
composer_full*().

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/crates/shirabe/src/command/about_command.rs b/crates/shirabe/src/command/about_command.rs
index 3e74d6e..e3c3614 100644
--- a/crates/shirabe/src/command/about_command.rs
+++ b/crates/shirabe/src/command/about_command.rs
@@ -4,7 +4,6 @@ use crate::command::BaseCommand;
 use crate::command::BaseCommandData;
 use crate::command::HasBaseCommandData;
 use crate::composer;
-use crate::composer::ComposerHandle;
 use crate::io::IOInterface;
 use crate::io::IOInterfaceImmutable;
 use shirabe_external_packages::symfony::component::console::input::InputInterface;