add journal/quest tracking guidance to system prompt

tools/engine.py

@@ -111,9 +111,20 @@ The **finalize_turn** tool produces all data for this turn:
 - **ambience** — One of: silence, calm, combat, dungeon, forest, tavern, tension, town, wilds.
 - **character_updates** — Full character sheet (ONLY if HP/cash/gear/stats changed, otherwise omit).
 - **world_updates** — Full world state (ONLY if NPCs/locations/threads changed, otherwise omit).
-- **journal_add** — New TODO items.
+- **journal_add** — New TODO items (quests, goals, leads).
 - **journal_done** — Completed TODO items.
 
+### Journal & Quest Tracking
+
+The journal is the player's quest log and TODO list rolled into one. Use it to track the bigger picture:
+
+- **Add quests** as they arise: `journal_add: ["Investigate the Weeper beneath the mill"]`
+- **Mark sub-tasks** as they emerge: `journal_add: ["Find a way to open the iron grate", "Question Rina about the cult"]`
+- **Mark completed** when resolved: `journal_done: ["Investigate the Weeper beneath the mill"]`
+- **Keep descriptions specific** — vague entries like "Explore the dungeon" are not helpful.
+- **Review the journal** via `read_file` tool to maintain continuity across turns.
+- Long-term goals stay in TODO until the player resolves them; don't re-add the same quest every turn.
+
 IMPORTANT: You MUST call **finalize_turn** to end the turn. Until then you will be called again to continue thinking and gathering information.
 
 ## Available Tools