fix(ci): add process.exit to graphlens-integration test

Root cause: graphlens-integration.test.cjs imports council.js which starts
MCP servers, leaving event loop alive and preventing test suite from exiting.

This caused the test suite to hang after completing all tests, triggering
CI timeout after 22+ minutes (tests actually complete in ~7 seconds).

Impact: Test suite now completes in 7s instead of hanging indefinitely.

Evidence:
- Local test run hung at graphlens-integration completion (backend/tests/graphlens-integration.test.cjs:140)
- Timeout testing showed test completes but process never exits
- Adding process.exit(0) resolves hang: 88 tests now complete in 6.9s

References:
- workspace/docs/Obsidian-v2/plans/active/TEST-PARALLELIZATION-IMPLEMENTATION.md
- workspace/docs/Obsidian-v2/daily/2025-11-01-GITHUB-ISSUES-ANALYSIS.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Michael

backend/tests/graphlens-integration.test.cjs

@@ -138,3 +138,6 @@ console.log('  2. Enable flags: ENABLE_GRAPHLENS_CONTENT=true ENABLE_GRAPHLENS_A
 console.log('  3. Trigger agent: curl -X POST http://localhost:8791/chat -d \'{"prompt": "@marketing test"}\'');
 console.log('  4. Watch live-dashboard.cjs for real-time GraphLens events');
 console.log();
+
+// Exit explicitly to avoid hanging (council.js imports start MCP servers)
+process.exit(0);