feat(mcp): add format argument to tool parameter schemas

Michael Angelo Riverarequested to merge
add-format-arg-to-mcp-tools into main

Summary

  • Adds an optional format parameter ("llm" or "raw") to both query_graph and get_graph_schema tool JSON schemas
  • Enables MCP consumers to request structured JSON output instead of the default LLM-optimized text
  • Cleans up tool registry: extracts test helpers, removes boilerplate

The format parameter is optional and defaults to llm (current behavior). A companion Rails MR will plumb the value through call_tool.rb to the existing format-aware gRPC layer.

Relates to #271 Relates to #433 Relates to gitlab-org#20566

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