Describe the bug
After updating or doing a fresh install of Hermes Agent, the kanban dispatcher fails repeatedly with:
sqlite3.OperationalError: no such column: session_id
It happens every few seconds when the gateway is running.

Steps to reproduce

1. Install or update Hermes Agent
2. Run hermes gateway start
3. Error appears constantly in logs

Environment

• WSL2 Ubuntu 24.04
• Running as root
• hermes kanban init was executed

Temporary workaround

rm -f ~/.hermes/kanban.db
hermes kanban init
Additional context
Seems to be a schema migration issue. New version expects session_id column but the existing database doesn't have it.