feat: replace activity markers with typed sites

docs/PROJECT_CONTEXT.md

@@ -180,9 +180,9 @@ The current prototype implements a very early version of observe, autonomous
 task choice, physical travel, work completion, resource change, and direct
 player assistance. NPC `gather_food` and `gather_wood` tasks now use finite
 world `ResourceNode` instances (berry bushes and trees) rather than abstract
-zone markers. The obsolete farm and forest markers have been removed. Separate
-temporary activity markers remain for rest, study, and patrol; eating and food
-transfer now target the typed village pantry. The migration is documented in
+zone markers. The obsolete farm, forest, and activity markers have been
+removed. Eating and food transfer target the typed village pantry, while rest,
+study, and patrol target typed activity sites. The migration is documented in
 [the ResourceNode plan](RESOURCE_NODE_MIGRATION.md).
 
 ## Current technology
@@ -207,7 +207,7 @@ plugin content, not game architecture.
 
 ### World and player
 
-- `main.tscn` contains a flat approximately 30×30 prototype ground.
+- `main.tscn` instances the reusable Jajce Terrain3D world.
 - The player is a `CharacterBody3D` represented by placeholder primitive
   geometry.
 - WASD movement is camera-relative.
@@ -215,17 +215,19 @@ plugin content, not game architecture.
   follow/focus behavior.
 - Pressing `E` near a berry bush or tree extracts its configured yield into the
   village through the same `ResourceNode` contract used by NPCs.
-- Guard, study, rest, and food interactions still use temporary activity
-  markers.
+- Guard, study, rest, and food interactions now use typed world sites.
 - `Escape` releases captured mouse input.
 
 ### Village simulation
 
-The simulation currently creates three NPCs:
+The simulation currently creates six NPCs:
 
 - Amina
 - Tarik
 - Jasmin
+- Elma
+- Mirza
+- Lejla
 
 Each receives a random profession from:
 
@@ -283,39 +285,34 @@ Needs override ordinary work. Otherwise a utility-like score combines:
 - profession preference;
 - a small random contribution.
 
-The visual NPC walks toward the task's marker. Arrival tells the simulation to
-start work. Work progresses on simulation ticks. The village receives the
-result only when the task duration completes.
+The visual NPC walks toward the task's typed target position. Arrival tells the
+simulation to start work. Work progresses on simulation ticks. The village
+receives the result only when the task duration completes.
 
 Starvation can reduce productivity and eventually kill an NPC. Dead visuals
 stop moving, change appearance, and no longer collide.
 
-### Current activity markers
+### Current world targets
 
-The main scene contains placeholder activity markers for guard duty, study,
-and rest. The former farm and forest zones and their decorative geometry have
-been deleted, and food storage now uses a typed pantry site.
+The former farm, forest, food, guard, study, and rest markers have been deleted.
+The runtime now uses semantic world targets:
 
 **Migration status:** NPC `gather_food` and `gather_wood` target `ResourceNode`
-instances (berry bushes and trees), with no marker fallback. The remaining
-markers are direct transitional targets for non-resource NPC tasks, while
-storage actions now route to a typed pantry site:
+instances (berry bushes and trees), with no marker fallback. Non-resource
+actions route through typed sites:
 
-- patrol → guard marker;
-- study → study marker;
-- rest → rest marker;
+- patrol → `ActivitySite` (`guard_post`);
+- study → `ActivitySite` (`study_desk`);
+- rest → `ActivitySite` (`rest_bench`);
 - eat/deposit/withdraw → `StorageNode` (`village_pantry`).
 
 The player also harvests food and wood directly from nearby `ResourceNode`
 instances. Extraction returns the actual amount removed, updates the village by
 that amount, and releases an NPC reservation if the source is depleted.
-The food bullet above is the historical transition point: active eating,
-deposit, and withdrawal now resolve to `WorldObjects/StorageSites/VillagePantry`
-instead of a pantry marker.
-
-Rest, study, and guard behavior should later migrate to target types that match
-their actual semantics rather than treating every usable object as a generic
-marker.
+Future resource expansion should add many finite `ResourceNode` instances rather
+than broad resource zones: trees in foliage clusters, berry patches, animal
+camps, and village stockpiles can be ranked by reachability, distance, safety,
+profession, and NPC comfort range.
 
 ### Jajce scaffold
 
@@ -327,8 +324,7 @@ marker.
 - fortress, houses, mill, bridge, shader river/waterfall, mist, and smoke;
 - warm sky, fog, shadows, and wind-reactive foliage;
 - four ResourceNodes preserving the flat-map stable IDs;
-- typed village pantry storage plus remaining guard, study, and rest activity
-  markers;
+- typed village pantry storage and typed guard, study, and rest activity sites;
 - a temporary baked navigation loop with 24 tested routes;
 - a look-development scene and camera.
 
@@ -506,11 +502,11 @@ NpcVisual navigates through the active world
 
 These are expected prototype constraints, not necessarily isolated bugs:
 
-- Action and profession IDs are stable and definition-backed, but activity
-  marker mapping and several action effects remain hard-coded.
-- Temporary activity markers remain for rest, study, and patrol; NPC and player
-  food/wood gathering use `ResourceNode` instances with no fallback, while food
-  transfer uses the typed pantry `StorageNode`.
+- Action and profession IDs are stable and definition-backed, but several
+  action effects remain hard-coded.
+- Temporary activity markers have been removed; NPC and player food/wood
+  gathering use `ResourceNode` instances with no fallback, food transfer uses
+  the typed pantry `StorageNode`, and patrol/study/rest use `ActivitySite`.
 - Current NPC, village, resource, storage, event, clock, and RNG state serialize
   through world schema v3. F5/F9 provide one validated local quicksave; a save
   menu, metadata, and player-transform persistence remain deferred.