Graphi 53/improve func spec for tool calls

[GuanyiLi-Craig]

1. Update function spec
2. add code string to topic condition

[Copilot]

Pull request overview

This pull request enhances the function specification system for LLM tool calls and improves topic condition serialization. The main changes include a comprehensive rewrite of the type-to-schema conversion logic to support more complex Python types, the addition of human-readable code strings alongside base64-encoded conditions in topic manifests, and updates to the ParameterSchema model to use Pydantic's flexible extra fields configuration.

• Significantly improved type-to-schema conversion supporting Union types, sequences, mappings, dataclasses, enums, and annotated types
• Added code string representation to topic conditions for better debugging and readability
• Updated FunctionSpec to include optional output schema information

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uv.lock	Version bump to 0.0.32 and addition of new platform-specific greenlet and psycopg2-binary wheels
grafi/common/decorators/llm_function.py	Major refactor introducing comprehensive type-to-JSON schema conversion with support for complex types, dataclasses, enums, and proper handling of Optional/Union types
grafi/common/models/function_spec.py	Updated ParameterSchema to use flexible extra fields and added output_schema to FunctionSpec
grafi/topics/topic_base.py	Enhanced to_dict() to include human-readable source code alongside base64-encoded condition; updated from_dict() to handle both formats for backward compatibility
grafi/topics/topic_impl/*.py	Updated all topic implementations to handle both old (string) and new (dict with base64 + code) condition formats during deserialization
tests_integration/function_call_assistant/simple_function_call_assistant.py	Refactored to define agent_output_condition at module level and pass it during OutputTopic construction for better code organization
tests_integration/function_call_assistant/simple_function_call_assistant_complex_function_example.py	New integration test demonstrating complex function with list and Optional parameters
tests_integration/function_call_assistant/complex_function_call_assistant_deserialize_assistant_example.py	New test for assistant deserialization from manifest
tests_integration/function_call_assistant/complex_function_manifest.json	New manifest file showing serialized assistant with function specs and topic conditions in new format
tests/tools/llm_function_calls/test_function_call_tool.py	Added tests for complex function types, invocation, and deserialization with Pydantic models

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