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>

2 files changed, 0 insertions, 2 deletions

diff --git a/crates/shirabe/src/util/http_downloader.rs b/crates/shirabe/src/util/http_downloader.rs
index 610bd3a..2a9f491 100644
--- a/crates/shirabe/src/util/http_downloader.rs
+++ b/crates/shirabe/src/util/http_downloader.rs
@@ -14,7 +14,6 @@ use shirabe_semver::constraint::AnyConstraint;
 use shirabe_semver::constraint::SimpleConstraint;
 
 use crate::composer;
-use crate::composer::ComposerHandle;
 use crate::config::Config;
 use crate::downloader::TransportException;
 use crate::io::IOInterface;
diff --git a/crates/shirabe/src/util/stream_context_factory.rs b/crates/shirabe/src/util/stream_context_factory.rs
index 488d807..d1c281b 100644
--- a/crates/shirabe/src/util/stream_context_factory.rs
+++ b/crates/shirabe/src/util/stream_context_factory.rs
@@ -9,7 +9,6 @@ use shirabe_php_shim::{
 };
 
 use crate::composer;
-use crate::composer::ComposerHandle;
 use crate::downloader::TransportException;
 use crate::repository::PlatformRepository;
 use crate::util::Filesystem;