feat: let opportunity helpers act autonomously

docs/ACTION_SYSTEM_ARCHITECTURE.md

@@ -5,6 +5,7 @@
 ```text
 SimulationManager tick
     -> ActionExecutionSystem advances needs and working progress
+    -> VillageOpportunitySystem re-derives the current capable helper
     -> ActionSelectionSystem chooses an action when the NPC is idle
     -> SimulationManager stores the selected action
     -> npc_target_requested
@@ -24,6 +25,9 @@ SimulationManager tick
 - queries `RelationshipSystem` after personal survival/schedule overrides, so a
   trusted starving acquaintance can redirect ordinary work toward food
   gathering while the pantry is low;
+- accepts the current ephemeral `OpportunityHelperResult` and, only for its
+  matching NPC, selects the reported ordinary gather/deposit action after
+  urgent self-care and sleep/meal schedule branches;
 - evaluates current utility scores;
 - consumes the NPC's deterministic decision RNG;
 - returns an action ID, optional urgent-duration override, branch reason,
@@ -68,9 +72,10 @@ SimulationManager remains the orchestrator and event boundary. It owns
 simulation records, invokes the focused systems, stores selected actions and
 targets, and translates presentation callbacks into simulation transitions.
 It also publishes the latest `ActionSelectionResult` for presentation; the UI
-does not recompute decisions. At completion it atomically pays any
-definition-backed stored-resource cost before applying the action effect. A
-late shortfall suppresses the effect and records a `task_blocked` fact. The
+does not recompute decisions. Each idle selection re-derives the capable helper
+instead of consulting persisted assignment state. At completion it atomically
+pays any definition-backed stored-resource cost before applying the action
+effect. A late shortfall suppresses the effect and records a `task_blocked` fact. The
 manager also captures actor/nearby knowledge before forwarding newly recorded
 events into `RelationshipSystem`. When an NPC arrives beside a worker at the
 same non-storage activity site, the manager may transfer one direct known fact