fix: enforce village resource invariants

docs/LEARNING_ROADMAP.md

@@ -652,14 +652,12 @@ Completed after the architecture gate:
 
 The practical next sequence is:
 
-1. Expand the structured event feed with actor/target/cause metadata so the
-   inspector can show a readable timeline per NPC. Narrative events for task
-   starts, sleep, and death are recorded; next should add depletion notices,
-   relationship seeds, and village-level event summaries filtered by relevance.
-2. Seed relationship dimensions (familiarity, trust, obligation) from shared
-   work, meal, and sleep proximity, then expose them through utility
-   considerations so NPCs begin to prefer known colleagues and familiar routes.
-   Start with one lightweight dimension before building the full graph.
+1. Move proven action preconditions and material costs into a reusable contract,
+   beginning with the patrol/study wood dependency, then expose unavailable
+   choices and interruption reasons in the NPC inspector.
+2. Grow the existing familiarity seed into one consequence-bearing relationship
+   dimension, such as trust or obligation, driven by structured events rather
+   than proximity alone.
 
 Recently completed:
 
@@ -706,7 +704,8 @@ Recently completed:
 - Wood inventory and woodpile storage: wood now follows the same
   gather→carry→deposit pattern as food. VillageWoodpile StorageNode receives
   wood deposits. Village wood syncs from storage. Economic events track all
-  transfers.
+  transfers. Patrol and study no longer produce benefits without paying their
+  one-wood cost, and utility selection avoids those actions when wood is empty.
 - Structured event feed: EconomicEventRecord now supports narrative events
   (task started, NPC slept, NPC died) alongside economic transfers.
   Per-NPC event history with human-readable descriptions exposed in the