Add engagement-only conversation mode

docs/configuration.md

@@ -41,7 +41,7 @@ Never document real values. `.env` is ignored and may contain production credent
 
 Physique targeting is owned only by its dedicated Monitoring controls. It is excluded from the advanced JSON response. Older cached dashboards may still submit a duplicate advanced copy; the server accepts but ignores that copy so it cannot overwrite the dedicated value persisted in `app_config`.
 
-Subreddit `type` is `image` or `chat`. Conversation policy contains `mode`, `maxAutomatedTurns`, and `rapportTurnsBeforeMediaAsk`; hybrid rapport turns must be lower than the maximum.
+Subreddit `type` is `image` or `chat`. Conversation policy contains `mode`, `maxAutomatedTurns`, and `rapportTurnsBeforeMediaAsk`; hybrid rapport turns must be lower than the maximum. `engagement` sends the normal opener but treats the first verified inbound reply as the terminal goal: no AI reply is generated and triage is marked done. `manual` also sends no automated reply, but deliberately surfaces the reply for an operator instead of completing it.
 
 ### `conversations`