python3Packages.llama-index-{agent,program,question-gen}-openai: remove

These packages were removed in upstream llama-index due to breaking changes:
- Agent classes including FunctionCallingAgent, ReActAgent, AgentRunner deprecated
- QueryPipeline class and associated code removed
- Agent-based chat engines removed in favor of workflow-based agents

Users should migrate to new workflow agents: FunctionAgent, CodeActAgent,
ReActAgent, and AgentWorkflow.

pkgs/development/python-modules/llama-index-agent-openai/default.nix

···
-{
-  lib,
-  buildPythonPackage,
-  fetchPypi,
-  hatchling,
-  llama-index-core,
-  llama-index-llms-openai,
-  pythonOlder,
-}:
-
-buildPythonPackage rec {
-  pname = "llama-index-agent-openai";
-  version = "0.4.12";
-  pyproject = true;
-
-  disabled = pythonOlder "3.8";
-
-  src = fetchPypi {
-    pname = "llama_index_agent_openai";
-    inherit version;
-    hash = "sha256-0v5T/rac/kV1LttzKL8NJfapBxs8BWeH5mG5Plt0iig=";
-  };
-
-  pythonRelaxDeps = [ "llama-index-llms-openai" ];
-
-  build-system = [ hatchling ];
-
-  dependencies = [
-    llama-index-core
-    llama-index-llms-openai
-  ];
-
-  pythonImportsCheck = [ "llama_index.agent.openai" ];
-
-  meta = with lib; {
-    description = "LlamaIndex Agent Integration for OpenAI";
-    homepage = "https://github.com/run-llama/llama_index/tree/main/llama-index-integrations/agent/llama-index-agent-openai";
-    license = licenses.mit;
-    maintainers = with maintainers; [ fab ];
-  };
-}

pkgs/development/python-modules/llama-index-program-openai/default.nix

···
-{
-  lib,
-  buildPythonPackage,
-  fetchPypi,
-  hatchling,
-  llama-index-agent-openai,
-  llama-index-core,
-  llama-index-llms-openai,
-}:
-
-buildPythonPackage rec {
-  pname = "llama-index-program-openai";
-  version = "0.3.2";
-  pyproject = true;
-
-  src = fetchPypi {
-    pname = "llama_index_program_openai";
-    inherit version;
-    hash = "sha256-BMlZouYWSJiUvS7uu5lQDW8cF9WIw9oN3HXr0+t0Ue4=";
-  };
-
-  pythonRelaxDeps = [ "llama-index-agent-openai" ];
-
-  build-system = [ hatchling ];
-
-  dependencies = [
-    llama-index-agent-openai
-    llama-index-core
-    llama-index-llms-openai
-  ];
-
-  pythonImportsCheck = [ "llama_index.program.openai" ];
-
-  meta = with lib; {
-    description = "LlamaIndex Program Integration for OpenAI";
-    homepage = "https://github.com/run-llama/llama_index/tree/main/llama-index-integrations/program/llama-index-program-openai";
-    license = licenses.mit;
-    maintainers = with maintainers; [ fab ];
-  };
-}

pkgs/development/python-modules/llama-index-question-gen-openai/default.nix

···
-{
-  lib,
-  buildPythonPackage,
-  fetchPypi,
-  hatchling,
-  llama-index-core,
-  llama-index-llms-openai,
-  llama-index-program-openai,
-}:
-
-buildPythonPackage rec {
-  pname = "llama-index-question-gen-openai";
-  version = "0.3.1";
-  pyproject = true;
-
-  src = fetchPypi {
-    pname = "llama_index_question_gen_openai";
-    inherit version;
-    hash = "sha256-XpMRtDPMJYH/ilMfoZ+zqiGBW6/3WqrN7xF2CslSKqk=";
-  };
-
-  build-system = [ hatchling ];
-
-  dependencies = [
-    llama-index-core
-    llama-index-llms-openai
-    llama-index-program-openai
-  ];
-
-  # Tests are only available in the mono repo
-  doCheck = false;
-
-  pythonImportsCheck = [ "llama_index.question_gen.openai" ];
-
-  meta = with lib; {
-    description = "LlamaIndex Question Gen Integration for Openai Generator";
-    homepage = "https://github.com/run-llama/llama_index/tree/main/llama-index-integrations/question_gen/llama-index-question-gen-openai";
-    license = licenses.mit;
-    maintainers = with maintainers; [ fab ];
-  };
-}

pkgs/development/python-modules/llama-index/default.nix

···
 {
   buildPythonPackage,
   hatchling,
-  llama-index-agent-openai,
   llama-index-cli,
   llama-index-core,
   llama-index-embeddings-openai,
···
   llama-index-legacy,
   llama-index-llms-openai,
   llama-index-multi-modal-llms-openai,
-  llama-index-program-openai,
-  llama-index-question-gen-openai,
   llama-index-readers-file,
   llama-index-readers-llama-parse,
 }:
···
   ];
 
   dependencies = [
-    llama-index-agent-openai
     llama-index-cli
     llama-index-core
     llama-index-embeddings-openai
···
     llama-index-legacy
     llama-index-llms-openai
     llama-index-multi-modal-llms-openai
-    llama-index-program-openai
-    llama-index-question-gen-openai
     llama-index-readers-file
     llama-index-readers-llama-parse
   ];

pkgs/top-level/python-packages.nix

···
 
   llama-index = callPackage ../development/python-modules/llama-index { };
 
-  llama-index-agent-openai = callPackage ../development/python-modules/llama-index-agent-openai { };
-
   llama-index-cli = callPackage ../development/python-modules/llama-index-cli { };
 
   llama-index-core = callPackage ../development/python-modules/llama-index-core { };
···
 
   llama-index-multi-modal-llms-openai =
     callPackage ../development/python-modules/llama-index-multi-modal-llms-openai
-      { };
-
-  llama-index-program-openai =
-    callPackage ../development/python-modules/llama-index-program-openai
-      { };
-
-  llama-index-question-gen-openai =
-    callPackage ../development/python-modules/llama-index-question-gen-openai
       { };
 
   llama-index-readers-database =