fix issues #17, #18

[jiangchangyue]

Summary

Fixes two QitOS bugs reported in #17 and #18. Native OpenAI-compatible tool schema export no longer emits invalid {"type": "any"} entries for DeepSeek/OpenAI-compatible tools= payloads. ReAct parsing is also more tolerant of common real-world action formats, including LangChain-style action blocks, XML-style tool calls, and fenced JSON snippets.

What Changed

• Fixed tool schema generation so Any parameters do not produce invalid JSON Schema type any.
• Omitted unbounded **kwargs from exported tool schemas.
• Added regression coverage for the affected CodingToolSet tools: agent_spawn, cron_create, cron_delete, and lsp_query.
• Hardened ReAct parsing for common action variants reported in [Bug]: ReActTextParser 无法解析常见 ReAct 变体（Action Input / XML 标签 / 围栏 JSON），DeepSeek 等模型解析失败率高 #18.
• Updated API/reference docs, README news, and CHANGELOG.md.

Why

This solves DeepSeek/OpenAI-compatible model requests failing with HTTP 400 before the first step because QitOS exported invalid native tool schemas. It also fixes parser compatibility gaps where valid-looking ReAct outputs from common agent/model workflows were not parsed into actions. Together these fixes make QitOS more reliable with native tool calling and real-world model output formats.

Validation

• pytest -q
• relevant lint / type checks
• examples or manual verification, if applicable

Commands run:

conda run -n qitos pytest tests/test_tool_registry_and_toolset.py tests/test_model_protocols.py tests/test_native_tool_calling_runtime.py tests/test_advanced_tools_and_executor.py tests/test_memory_and_parser_and_critic.py -q
# 40 passed

conda run -n qitos pytest tests/test_memory_and_parser_and_critic.py::test_react_parser_accepts_common_action_variants_from_issue_18 tests/test_memory_and_parser_and_critic.py::test_json_decision_parser_salvages_wrapped_json_like_blocks -q
# 2 passed

conda run -n qitos python -m compileall qitos/core tests/test_tool_registry_and_toolset.py

git diff --check

INF_API_KEY=<redacted> conda run -n qitos python -c "<live DeepSeek ds-v4-pro request using QitOS-exported CodingToolSet schemas>"
# HTTP 200, no schema error

INF_API_KEY=<redacted> conda run -n qitos python -c "<live QitOS OpenAICompatibleModel call against ds-v4-pro>"
# returned OK, api_error=False