Add Anthropic Claude provider

[Angelchev]

Summary

• implement a new Anthropic Claude provider
• expose Anthropic source in Vim
• include default Anthropic settings
• document the Anthropic provider
• test the new provider in Python and Vim

Testing

• python -m pytest -q

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https://chatgpt.com/codex/tasks/task_b_6851b9c702008323ae60f3e7a6ff4d6e

[Copilot]

Pull Request Overview

This PR integrates a new Anthropic Claude provider into Neural, including code, Vim integration, documentation, and tests.

• Introduce Python implementation for Anthropic Claude with streaming completion and error handling.
• Add Vimscript defaults and source registration for Anthropic, plus corresponding Vader tests.
• Update documentation and add comprehensive Python and Vim tests.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/vim/test_config.vader	Added a Vader test for default Anthropic config
test/vim/test_anthropic.vader	Added a Vader test for the Anthropic source dictionary
test/python/test_anthropic.py	Added unit tests for config loading, streaming, and errors
neural_providers/anthropic.py	New Anthropic Claude provider implementation
autoload/neural/source/anthropic.vim	Vimscript function for Anthropic source
autoload/neural/config.vim	Added default Anthropic settings to config
doc/neural.txt	Updated TOC and added Anthropic Claude docs

Comments suppressed due to low confidence (1)

test/python/test_anthropic.py:49

• [nitpick] The test name test_main_function_rate_other_error is misleading—it tests generic HTTP errors, not rate-limit errors. Renaming to something like test_main_function_other_http_error would improve clarity.

def test_main_function_rate_other_error() -> None:

[Copilot]

The variable role is declared but never used in get_claude_completion. Consider removing it to reduce dead code.

Suggested change

role: Optional[str] = None

[Copilot]

[nitpick] Bypassing SSL verification on Darwin can expose MITM risks. Consider using a verified context or clearly documenting the trusted use case.

Suggested change

	ssl._create_unverified_context() # type: ignore
	ssl.create_default_context()

[Copilot]

Catching all Exceptions is too broad. Narrow the exception to json.JSONDecodeError or KeyError to avoid masking unexpected errors.

Suggested change

	except Exception:
	pass
	except json.JSONDecodeError:
	pass
	except KeyError:
	pass