fix(git-bitbucket-driver): match PHP exception/fallibility semantics for fallback paths

VcsDriverInterface::get_source/get_dist were made fallible in the Rust
port even though PHP's are infallible, forcing GitBitbucketDriver's
fallback delegation to silently swallow errors via
unwrap_or_default()/ok().flatten(). Make the trait infallible to match
PHP, updating the mechanical Ok(...) wrapping in all implementors.

Also narrow attempt_clone_fallback's cleanup to only trigger on
RuntimeException, mirroring PHP's catch (\RuntimeException $e), using
the same downcast pattern already used by has_composer_file for
TransportException.

1 files changed, 2 insertions, 2 deletions

diff --git a/crates/shirabe/src/repository/vcs_repository.rs b/crates/shirabe/src/repository/vcs_repository.rs
index 8d747c6..6a31c78 100644
--- a/crates/shirabe/src/repository/vcs_repository.rs
+++ b/crates/shirabe/src/repository/vcs_repository.rs
@@ -869,7 +869,7 @@ impl VcsRepository {
         );
 
         if !data.contains_key("dist") {
-            let dist = driver.get_dist(identifier)?;
+            let dist = driver.get_dist(identifier);
             data.insert(
                 "dist".to_string(),
                 match dist {
@@ -883,7 +883,7 @@ impl VcsRepository {
             );
         }
         if !data.contains_key("source") {
-            let source = driver.get_source(identifier)?;
+            let source = driver.get_source(identifier);
             data.insert(
                 "source".to_string(),
                 PhpMixed::Array(