Summary

Add cross-file fallback for Class-to-Function CONTAINS edge creation, enabling class_hierarchy and overrides queries to return methods for C++ classes.

Problem

In C/C++, classes are declared in .h files and methods are defined in .cpp files. The existing CONTAINS edge creation matched Class and Function nodes only when they shared the same file path:

MATCH (c:Class {name: $class_name, path: $path})
MATCH (fn:Function {name: $func_name, path: $path, ...})

This never succeeds for C++ method definitions, so class_hierarchy returned 0 methods and overrides returned 0 results for all C++ classes.

Solution

Try the same-file match first (works for Python, JS, etc.), then fall back to matching the Class node by name only:

MATCH (c:Class {name: $class_name})
MATCH (fn:Function {name: $func_name, path: $path, ...})

This requires the Function node to have a class_context property (provided by #734).

Known limitation

The cross-file fallback matches by class name only (no path constraint). Classes with identical names in different files could get false links. The same-file match is always tried first, so this only affects languages with header/implementation file splits (C, C++, Objective-C). This is documented in a code comment.

Impact

On a 300-file C++ codebase:

• class_hierarchy("QueueElement_Dialer_Export") now returns 1 parent, 3 children, and 42 methods (previously: 0 parents, 0 methods)
• overrides("execute") now returns 6 implementations across classes (previously: 0)

Depends on

• fix(cpp): fix NameError in _find_enums crashing enum parsing #733 (fix/cpp-find-enums-nameerror)
• feat(cpp): improve C++ parser for inheritance, methods, and calls #734 (feat/cpp-parser-improvements) — adds class_context to Function nodes

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