fix(graph): fix cyclic graph behavior

[mkmeral]

Description

This PR fixes a bug in the Graph multiagent pattern where the reset_on_revisit feature failed to enable cycles and feedback loops. The issue was in the _find_newly_ready_nodes method, which filtered out completed nodes before they could be revisited, making it impossible to implement feedback loops even when reset_on_revisit=True.

Key Changes:

1. Fixed node revisiting logic: Modified _find_newly_ready_nodes to accept a completed_batch parameter and check conditions against the current batch rather than the global completed nodes state
2. Improved condition checking: Updated _is_node_ready_with_conditions to work with the current execution batch instead of relying on global state
3. Enhanced test coverage: Added comprehensive tests for:
   • Basic cyclic graph execution with proper exit conditions
   • Self-loop functionality with various scenarios
   • Complex multi-node graphs with cycles
   • Edge cases including infinite loop prevention and state reset behavior

Technical Details:

• The bug prevented completed nodes from being reconsidered for execution, breaking feedback loops
• The fix allows nodes to be revisited when their incoming edge conditions are satisfied
• State reset functionality now works correctly for revisited nodes
• Added safety mechanisms (execution limits and timeouts) to prevent infinite loops

Related Issues

Fixes #684

Documentation PR

No documentation changes required - this is a bug fix that restores intended functionality.

Type of Change

Bug fix

Testing

How have you tested the change?

• Added comprehensive test suite covering cyclic graph execution scenarios
• Tested self-loop functionality with various conditions
• Verified state reset behavior during node revisits
• Added edge case testing for infinite loop prevention
• All existing tests continue to pass

Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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I updated the PR