Fix generator race condition and audit cleanup
- Fix get_agent_end_state to check file contents for terminal events
even when file is still _active.jsonl (Callosum broadcasts before rename)
- Fix SEGMENT_KEY extraction path in cortex token logging
- Remove redundant typing import in cortex.py
- Update docs: WebSocket → Callosum, think.mcp_tools → think.mcp
- Rename all "insights" terminology to "generators" across codebase
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>