feat: derive capable opportunity helpers

docs/BUILD_IN_PUBLIC_PLAN.md

@@ -731,13 +731,18 @@ Completed:
     player tree-harvest resolutions use real economy history; interested-party
     death and one-day staleness close the need cleanly. The compact UI explains
     the blocked action without reusing the pantry's hunger cue.
+28. Explainable capable helper: an open food or wood need now names one
+    deterministic informed and trusted villager plus the ordinary gather or
+    deposit action and real inventory/resource route that makes them capable.
+    The result is re-derived after restore and does not assign work or alter the
+    simulation.
 
 Next:
 
-1. Add the first read-only capable-helper query for an open need. Expose one
-   deterministic viable villager and the real knowledge, relationship, action,
-   inventory, and resource facts behind that result before allowing it to
-   affect autonomous selection, as sequenced in `LEARNING_ROADMAP.md`.
+1. Let the currently derived helper consume the query through ordinary
+   autonomous action selection, after urgent self-care and schedule precedence.
+   Re-query instead of persisting assignment, and keep acceptance/rewards out
+   of scope, as sequenced in `LEARNING_ROADMAP.md`.
 
 Do not start with GIS data, a full city, a large asset pack, or more NPC
 mechanics. The next proof is a beautiful stage for the systems that already