refactor: remove deprecated references to claude-3-sonnet-20240229

[dragos199993]

• Removed all instances of claude-3-sonnet-20240229 from settings.py, providers.py, and test files.
• Updated tests to use the new claude-sonnet-4-5-20250929 model.
• Deleted obsolete test cassettes related to the removed model.

---

Note

Remove all references to claude-3-sonnet-20240229, update tests to claude-sonnet-4-5-20250929, delete obsolete cassettes, and harden API error parsing.

• Core:
  • Remove claude-3-sonnet-20240229 from notdiamond/llms/providers.py and notdiamond/settings.py (models, support_tools, openrouter_identifier, price).
  • Improve API error handling in notdiamond/llms/request.py::model_select_parse to parse error.message and fallback formats.
• Tests/Docs:
  • Replace anthropic/claude-3-sonnet-20240229 with anthropic/claude-sonnet-4-5-20250929 across documentation tests and LangChain integration tests.
  • Remove test cases specifically for claude-3-sonnet-20240229 and delete associated VCR cassettes.
  • Keep remaining Anthropic tests (opus, haiku, sonnet variants) unchanged.

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[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
notdiamond/llms
providers.py
request.py					128
notdiamond/toolkit
custom_router.py
notdiamond/toolkit/rag
evaluation.py
testset.py
workflow.py
tests/test_llm_calls
test_anthropic.py
tests/test_toolkit/rag
test_data_gen.py
test_example_workflow.py
Project Total

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