Segment Analytics Telemetry

What: Dual telemetry system that sends all events to both Statsig and Segment analytics platforms

How to use:

# Telemetry is enabled by default and respects existing opt-out mechanisms
export DISABLE_TELEMETRY=1  # Disables both Statsig and Segment
export CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1  # Also disables both

Details:

• All existing telemetry events (tool usage, file operations, security checks, etc.) now tracked to Segment in addition to Statsig
• Uses anonymous IDs by default (claudecode.v1.{uuid}), adds user IDs when authenticated with Claude.ai
• Feature-gated behind tengu_log_segment_events Statsig flag for controlled rollout
• Events batched (15 per flush) and auto-flushed every 10 seconds
• Graceful shutdown ensures no data loss on exit
• Evidence: j1() at line 475648, Os2() at line 475587, Ms2 at line 475622