feat: Add network activity monitoring to tool execution verifier

[qizwiz]

This PR adds network activity monitoring to the tool execution verification system to detect when tools fabricate results without making actual network calls.

Summary

• Add NetworkEvent dataclass to capture network request evidence
• Add NetworkMonitor class to hook HTTP libraries and capture activity
• Enhance ToolExecutionWrapper to include network monitoring during execution
• Update ExecutionRecord to store network activity evidence
• Enhance complete_execution to accept and store network events
• Add AgentExecutionInterface and enhance_tool_for_verification utilities

Verification

This addresses the need to verify that tools making network requests actually execute those requests rather than fabricating responses. The system can now distinguish between:

• LIKELY_REAL: Network activity detected during tool execution
• LIKELY_FAKE: No network activity detected when network calls were expected

Backward Compatibility

All existing functionality is preserved and all original tests continue to pass.

---

[!NOTE] Add HTTP network activity monitoring to tool execution verification and store captured events with execution records, with docs, demos, and tests.

• Verification utilities:
  • Add NetworkEvent and NetworkMonitor to capture HTTP activity by hooking requests/urllib.
  • Enhance ToolExecutionWrapper to monitor executions and persist events via ExecutionRegistry.complete_execution; extend ExecutionRecord with network_activity.
  • Introduce AgentExecutionInterface and helper wrappers in src/crewai/utilities/tool_execution_verifier.py.
• Documentation:
  • New guides: NETWORK_MONITORING_FEATURE.md, src/crewai/utilities/NETWORK_MONITORING_README.md (design, usage, verification logic).
• Examples & tests:
  • Add src/crewai/utilities/demo_network_monitoring_feature.py and src/crewai/utilities/test_network_monitoring_concept.py.
  • Adjust existing tests for clearer exception assertions and minor security annotations.

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