feat(vcs): implement VcsDriverInterface for all VCS drivers

Reconcile the VcsDriverInterface trait with the concrete drivers so every
driver implements it as in PHP, where each driver extends VcsDriver.

- Make cache-mutating getters take &mut self in the trait, matching the
  inherent methods' lazy-cache semantics; update vcs_repository consumers.
- Change supports() to take Rc<RefCell<Config>> and return Result<bool>,
  completing GitDriver::supports deep ls-remote and its config wiring.
- Add base get_composer_information to Git/Hg/Fossil/Perforce and an
  impl VcsDriverInterface block to every driver, delegating to inherent
  methods and absorbing type differences in the impl.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/crates/shirabe/src/repository/vcs_repository.rs b/crates/shirabe/src/repository/vcs_repository.rs
index 9a39b76..e90ac62 100644
--- a/crates/shirabe/src/repository/vcs_repository.rs
+++ b/crates/shirabe/src/repository/vcs_repository.rs
@@ -416,7 +416,7 @@ impl VcsRepository {
             }
 
             let result: Result<()> = (|| -> Result<()> {
-                let driver = self.driver.as_ref().unwrap();
+                let driver = self.driver.as_mut().unwrap();
                 let data_opt = driver.get_composer_information(&identifier)?;
                 if data_opt.is_none() {
                     if is_very_verbose {
@@ -667,8 +667,11 @@ impl VcsRepository {
             }
 
             let result: Result<()> = (|| -> Result<()> {
-                let driver = self.driver.as_ref().unwrap();
-                let data_opt = driver.get_composer_information(&identifier)?;
+                let data_opt = self
+                    .driver
+                    .as_mut()
+                    .unwrap()
+                    .get_composer_information(&identifier)?;
                 if data_opt.is_none() {
                     if is_very_verbose {
                         self.io.write_error(&format!(
@@ -689,7 +692,7 @@ impl VcsRepository {
                 );
 
                 data.shift_remove("default-branch");
-                if driver.get_root_identifier()? == branch {
+                if self.driver.as_mut().unwrap().get_root_identifier()? == branch {
                     data.insert("default-branch".to_string(), PhpMixed::Bool(true));
                 }
 
@@ -703,6 +706,7 @@ impl VcsRepository {
                     ));
                 }
 
+                let driver = self.driver.as_ref().unwrap();
                 let package_data = self.pre_process(&**driver, data, &identifier)?;
                 let package = self
                     .loader