Draft: feat: implement get_repository_file MCP tool

Nathan Weinshenkerrequested to merge
workloads/b41b0d21f88 into master

Relates to issue #566140

Changes

  • Add get_repository_file MCP tool to Repository Files API endpoint
  • Map to existing GET /projects/:id/repository/files/:file_path endpoint
  • Support required parameters: id, file_path, ref
  • Follow established MCP framework pattern using route_setting annotation
  • Add Duo Context Exclusion support using Ai::FileExclusionService

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