fix(semver): resolve shirabe-semver compile errors

- Replace RefCell with Mutex in Constraint for thread safety
- Add clone_box() to ConstraintInterface for cloning trait objects
- Propagate Result from Constraint::new() and unwrap at call sites
- Fix VersionParser instantiation (unit struct, not fn)
- Add indexmap dependency to shirabe-semver

1 files changed, 2 insertions, 0 deletions

diff --git a/crates/shirabe-semver/src/constraint/constraint_interface.rs b/crates/shirabe-semver/src/constraint/constraint_interface.rs
index 980a23a..f8879b3 100644
--- a/crates/shirabe-semver/src/constraint/constraint_interface.rs
+++ b/crates/shirabe-semver/src/constraint/constraint_interface.rs
@@ -22,5 +22,7 @@ pub trait ConstraintInterface {
         false
     }
 
+    fn clone_box(&self) -> Box<dyn ConstraintInterface>;
+
     fn as_any(&self) -> &dyn std::any::Any;
 }