- api_client.py: APIClient class with ProviderConfig types,
chat_stream() returns str instead of printing,
module-level wrappers for backward compat
- tools.py: ToolRegistry class with instance methods,
pure Python list_files (os.walk) and search_in_files (re.search)
replacing find/grep for Windows compat,
English tool descriptions and error messages,
module-level wrappers for backward compat
- 74 new tests (21 api_client + 53 tools)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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