feat: persist orchestrator sessions + user service + docs update

- Orchestrator now saves turns to session store so history survives page refresh
- UI session_id updated from job result; history controls attached to agent turns
- Cortex migrated from system service to systemd user service (no more sudo)
- Update README.md and CLAUDE.md with correct service commands

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -23,22 +23,26 @@ Cortex is a self-hosted multi-agent orchestration layer. Inara is the primary co
 
 ## Running Cortex
 
+Cortex runs as a **systemd user service** (no sudo required).
+
 ```bash
-# Start (Docker)
-cd ~/agents_sync/projects/Cortex_and_Inara_dev
-docker compose up -d
+# Start / stop / restart
+systemctl --user start cortex
+systemctl --user stop cortex
+systemctl --user restart cortex
 
-# Restart service only (after backend changes)
-sudo systemctl restart cortex
-
-# Logs
-journalctl -u cortex -f
+# Status and logs
+systemctl --user status cortex
+journalctl --user -u cortex -f
 
 # Web UI
 http://localhost:8000   (or cortex.dgrzone.com on WireGuard)
 ```
 
-Config lives in `cortex/config.py` and a `.env` file at the project root (not tracked — see `env.default`).
+The service starts automatically at boot via `loginctl enable-linger`.
+Service file: `~/.config/systemd/user/cortex.service`
+
+Config lives in `cortex/config.py` and a `.env` file at the project root (not tracked — see `.env.default`).
 
 ---