fix(spin-module-system): resolve named JPMS module names from module-info.class

[deer]

• Threads CodeModel through PomWorkspaceWalker and the PomBased* resources so that named JPMS modules (those with a module-info.class in their jar) are identified correctly, instead of relying solely on heuristic name derivation and Automatic-Module-Name. This fixes module resolution for jars like those from lang.build that use proper named modules.
• Adds a getArtifact(ModuleReference) fallback in PomBasedModuleCatalog that probes the local repository by naming-convention heuristic when a module reference isn't already in the catalog.
• Fixes two POM parsing gaps: <dependencyManagement> entries are now inherited transitively from <parent> poms (up to depth 8), and same-groupId sibling dependencies with no explicit <version> now correctly inherit the pom's own version.
• Cleans up the readDependencyManagement private recursive helper to use Optional<Path> instead of a nullable sentinel.