refactor: remove serve decorator name field for simplicity and AgentRegistry

[vcfgv]

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[Copilot]

Pull Request Overview

This PR simplifies the agent system by removing the name parameter from the @serve decorator and refactoring the AgentRegistry from a class-based to an instance-based approach with module-level convenience functions.

• Removed name parameter from @serve decorator, now using class name directly
• Refactored AgentRegistry from static class methods to instance methods with a global default instance
• Added comprehensive unit tests for the new registry system

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
python/valuecell/examples/core_e2e_demo.py	Removed name parameters from @Serve decorators and reduced sleep time
python/valuecell/core/agent/tests/test_registry.py	Added comprehensive test suite for the new AgentRegistry system
python/valuecell/core/agent/registry.py	Refactored from class methods to instance methods with convenience functions
python/valuecell/core/agent/decorator.py	Updated to use register_agent function and removed name parameter handling
python/valuecell/core/agent/connect.py	Updated imports to use new registry convenience functions
python/valuecell/core/agent/README.md	Updated documentation to remove name parameter examples
.github/workflows/python.yml	Added unit test job to CI workflow

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[Copilot]

This comment and the changed expectation suggest a potential misunderstanding of the unregister behavior. The comment should clearly explain why 'Other' is removed when unregistering by pattern 'Test', as this might not be intuitive to readers.

Suggested change

	# Note: Since TestAgent1 was unregistered by "Test_1", "Other" is also removed
	# Note: In this registry implementation, unregistering any key for a class removes all keys for that class.
	# Therefore, since "Test_1" (registered to TestAgent1) is unregistered, all keys for TestAgent1, including "Other", are also removed.