Optimize logging: move verbose logs to DEBUG level

[aviweit]

Logging Optimization

Summary

Optimize logging levels to reduce log file size by 70-80% during benchmark runs by moving verbose logs from INFO to DEBUG level.

Changes

skillberry-benchmarks

• File: tau2/tau2-bench/src/tau2/agent/lang_chain_agent_mcp.py
• Removed langgraph_logger.setLevel(logging.DEBUG) override
• Changed 13 verbose INFO logs → DEBUG (loops, schema dumps, detailed inspections)
• Replaced 4 print() statements with logger.debug()

skillberry-agent

• File: shared/python/skillberry_agent_lib/skillberry_agent_lib/mcp_interceptor.py

• Changed 1 exit log from INFO → DEBUG for consistency

• File: shared/python/skillberry_agent_lib/skillberry_agent_lib/langgraph_nodes.py

• Changed 30+ verbose INFO logs → DEBUG (message inspection loops, tool call details)

Impact

• Log file size: 70-80% reduction expected
• INFO logs: Now show only high-level operational flow
• DEBUG logs: Contain all verbose details for troubleshooting
• No functional changes: Only logging level adjustments

Testing

• Run tau2 benchmark with INFO logging
• Verify log file size reduction
• Confirm essential events still logged at INFO
• Test DEBUG mode for verbose troubleshooting

Branch

feature/logging-optimization (same name in both repos)