[Bug] module_deps query fails with KeyError 'imported_by_files' #757

Description

The module_deps query type in analyze_code_relationships fails with a Python KeyError on v0.3.1 with KùzuDB backend.

Steps to Reproduce

pip install codegraphcontext==0.3.1
cgc index /path/to/any/project

Then via MCP:

codegraph_analyze_code_relationships(query_type="module_deps", target="any_module.js")

Expected Behavior

Module dependency information (imports/imported-by) should be returned.

Actual Behavior

{
  "error": "Error executing relationship query: 'imported_by_files'",
  "query_type": "module_deps",
  "target": "any_module.js"
}

Root Cause Analysis

This appears to be a Python KeyError — the code tries to access a key 'imported_by_files' from a dictionary result, but that key doesn't exist. This is different from the list_extract issue (#756) — it's a bug in the Python handler for module_deps, not a Cypher compatibility issue.

Environment

• codegraphcontext: 0.3.1
• Database backend: KùzuDB (default)
• Python: 3.12.3
• OS: Linux (Ubuntu)