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This fixes issue #4041 where system signal events (SigTermEvent, SigIntEvent, etc.) were disabled when telemetry was disabled. Changes: - Create SystemSignalManager class to handle OS signal registration independently of telemetry settings - Move signal registration from Telemetry to SystemSignalManager - Register signal handlers at system_events.py module import time - Update Telemetry to subscribe to signal events via event bus instead of owning the signal handlers - Add comprehensive tests for signal events with telemetry disabled and signal handler chaining The signal events now work regardless of CREWAI_DISABLE_TELEMETRY setting, and properly chain to any handlers registered before CrewAI imports. Co-Authored-By: João <joao@crewai.com>