feat: add /stop and /reset chat commands and bots internals docs section

Add two new chat commands (`/stop` and `/reset`) to the Devii WebSocket handler, enabling users to stop or reset a session via text input. Introduce a new "Bots internals" documentation section with six prose pages covering architecture, personas, content generation, engagement, realism, and configuration for the autonomous bot fleet. Extend the bot service with article scoring, category picking, configurable pause/break timing, and a `gist_min_lines` parameter for LLM client initialization.

devplacepy/routers/devii.py

@@ -219,6 +219,13 @@ async def devii_ws(websocket: WebSocket):
                 text = str(data.get("text", "")).strip()
                 if not text:
                     continue
+                command = text.lower().lstrip("/").strip()
+                if command == "stop":
+                    await session.stop()
+                    continue
+                if command == "reset":
+                    await session.reset()
+                    continue
                 limit = svc.daily_limit_for(owner_kind, owner_is_admin)
                 spent = svc.spent_24h(owner_kind, owner_id)
                 if limit > 0 and spent >= limit:
@@ -232,6 +239,8 @@ async def devii_ws(websocket: WebSocket):
                 session.spawn_turn(text)
             elif kind == "reset":
                 await session.reset()
+            elif kind == "stop":
+                await session.stop()
             elif kind == "clear":
                 await session.reset_conversation()
             elif kind == "visibility":