bug: combat turn returns success=false, damage=0, empty description on every call

[Sealjay]

Summary

POST /combat/{combat_id}/turn consistently returns:

{"combat_id": "...", "success": false, "damage": 0, "description": "", "next_turn": true}

• success: false on every turn — no actions ever succeed
• damage: 0 — no damage is ever dealt
• description: "" — empty narration
• target_id: null — target is not resolved

This is because CombatMCAgent.start_combat() is never called (see #707), so encounters remain in 'ready' state and action processing fails silently, returning the default empty result object.

Repro

POST /game/combat/initialize {"character_ids": ["char_id"], "enemies": [...]}
POST /game/combat/{combat_id}/turn {"character_id": "char_id", "action": "attack", "target": "Goblin"}
# Returns success=false, damage=0, description=''

Root Cause

Same as #706, #707 — combat system is fully broken end-to-end.

Files

• backend/app/api/routes/combat_routes.py — process_turn()
• backend/app/agents/combat_mc_agent.py — process_combat_action()