fix: clean up stray topics/summaries references from insights migration
- Fix critical bug in mcp_tools.py using wrong path for insights
- Update UI tabs and URLs from 'summaries' to 'insights'
- Update documentation (JOURNAL.md, AGENTS.md, README.md, CORTEX.md)
- Rename integration test file and update function calls
- Fix docstring comments in apps/agents/routes.py
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Co-Authored-By: Claude <noreply@anthropic.com>