refactor(semver): change ConstraintInterface to a closed enum

Replace the dyn ConstraintInterface trait objects with an AnyConstraint
enum closing over its four implementors (Simple, Multi, MatchAll,
MatchNone), mirroring the earlier Rule enum conversion. Rename
constraint.rs to simple_constraint.rs to match the renamed Constraint
type.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/crates/shirabe/src/dependency_resolver/solver.rs b/crates/shirabe/src/dependency_resolver/solver.rs
index e4539d2..820f792 100644
--- a/crates/shirabe/src/dependency_resolver/solver.rs
+++ b/crates/shirabe/src/dependency_resolver/solver.rs
@@ -8,7 +8,7 @@ use indexmap::IndexMap;
 use shirabe_php_shim::{
     PhpMixed, array_pop, array_shift, array_unshift, microtime, spl_object_hash, sprintf,
 };
-use shirabe_semver::constraint::ConstraintInterface;
+use shirabe_semver::constraint::AnyConstraint;
 
 use crate::dependency_resolver::Decisions;
 use crate::dependency_resolver::GenericRule;
@@ -189,8 +189,8 @@ impl Solver {
             // TODO(phase-b): ConstraintInterface is a PHP class — Box<dyn ConstraintInterface>
             // cannot be cloned. We borrow the original constraint and only allocate a fresh
             // box when the ignore filter rewrites it.
-            let mut filtered: Option<Box<dyn ConstraintInterface>> = None;
-            let constraint_ref: &dyn ConstraintInterface = constraint.as_ref();
+            let mut filtered: Option<AnyConstraint> = None;
+            let constraint_ref: &AnyConstraint = constraint;
             if platform_requirement_filter.is_ignored(package_name) {
                 continue;
             } else if let Some(ignore_filter) = platform_requirement_filter
@@ -204,8 +204,7 @@ impl Solver {
                 let _ = &mut filtered;
             }
 
-            let active_constraint: &dyn ConstraintInterface =
-                filtered.as_deref().unwrap_or(constraint_ref);
+            let active_constraint: &AnyConstraint = filtered.as_ref().unwrap_or(constraint_ref);
 
             if self
                 .pool