Apply override at Definition level for direct dependencies

The Resolver-only hook reshapes deps just before PubGrub sees them,
but it does not influence the Bundler::Dependency objects fed into
Definition#expanded_dependencies. As a result the
Resolver::Package built from each direct dep keeps the original
requirement, so its prerelease policy and (in later commits) lockfile
change detection ignore the override entirely. Apply the override to
direct deps at expanded_dependencies as well so that Package metadata
and convergence see the effective requirement; the Resolver hook
remains responsible for transitive deps fetched from gemspecs.

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

Author: hsbt

bundler/lib/bundler/definition.rb

@@ -635,7 +635,20 @@ def resolver
     end
 
     def expanded_dependencies
-      dependencies_with_bundler + metadata_dependencies
+      apply_overrides_to(dependencies_with_bundler) + metadata_dependencies
+    end
+
+    def apply_overrides_to(deps)
+      return deps if @overrides.empty?
+      deps.map {|dep| apply_override_to(dep) }
+    end
+
+    def apply_override_to(dep)
+      override = @overrides.find {|o| o.target == dep.name && o.field == :version }
+      return dep unless override
+      new_dep = dep.dup
+      new_dep.instance_variable_set(:@requirement, override.apply_to(dep.requirement))
+      new_dep
     end
 
     def dependencies_with_bundler