Contradictory specs: traverse() on a missing node throws vs returns [] #18

Two existing tests specify opposite behaviour for traversal from a missing node:

• tests/unit/Database.test.ts:746: expect(() => db.traverse(99999)).toThrow('Start node with ID 99999 not found')
• tests/unit/TraversalQuery.test.ts:735: db.traverse(99999).out('LINKS').toArray() should return []

Database.traverse has thrown since cc29cb8 (2025-10-27), so the second test fails on main. One of the two specs has to change; this needs an owner decision, not a code fix.