feat: replace activity markers with typed sites

docs/BUILD_IN_PUBLIC_PLAN.md

@@ -41,8 +41,8 @@ Do not redo these tasks:
 - hunger, energy, starvation, death, task scoring, and task duration;
 - task-change and village-change signals;
 - visual NPC navigation and arrival reporting;
-- finite berry/tree ResourceNodes plus food, guard, study, and rest activity
-  markers;
+- finite berry/tree ResourceNodes plus typed food, guard, study, and rest
+  world sites;
 - aggregate village UI;
 - initial tree assets;
 - a baked navigation region for the current flat test area.
@@ -56,21 +56,20 @@ plugin content. They are references, not the game.
 
 ```text
 Main
-├── current flat World and NavigationRegion3D
+├── JajceWorld
 ├── Player
 ├── CameraRig
 ├── SimulationManager
 ├── WorldViewManager
 ├── ActiveNPCs
-├── ActivityMarkers
+├── typed world sites inside JajceWorld/WorldObjects
 ├── WorldEnvironment
 └── UI
 ```
 
-The player and `WorldViewManager` still reference non-resource activity sites
-through exported `NodePath` values. `NpcVisual` relies on the navigation map to
-reach legacy guard/study/rest markers, `ResourceNode` interaction points, and
-the typed village pantry `StorageNode`.
+The player still references interactable world sites through exported `NodePath`
+values. `NpcVisual` relies on the navigation map to reach typed `ActivitySite`,
+`StorageNode`, and `ResourceNode` interaction points.
 
 Replacing the ground without respecting those references would break behavior
 that already works.
@@ -95,12 +94,12 @@ Main
 │   │   ├── ResourceNodes
 │   │       ├── BerryBush instances
 │   │       └── Tree instances
-│   │   └── StorageSites
-│   │       └── VillagePantry
-│   ├── LegacyActivityMarkers          temporary non-resource activities
-│   │   ├── GuardZone
-│   │   ├── StudyZone
-│   │   └── RestZone
+│   │   ├── StorageSites
+│   │   │   └── VillagePantry
+│   │   └── ActivitySites
+│   │       ├── GuardPost
+│   │       ├── StudyDesk
+│   │       └── RestBench
 │   ├── DirectionalLight3D
 │   └── WorldEnvironment
 ├── Player
@@ -111,11 +110,10 @@ Main
 └── UI
 ```
 
-`JajceWorld` should contain geography, world-object presentations, and temporary
-legacy interaction locations. The pantry has since moved out of
-`LegacyActivityMarkers` into `WorldObjects/StorageSites/VillagePantry`; guard,
-study, and rest remain temporary markers. `JajceWorld` should not own
-`SimulationManager`, simulated NPC data, player state, or UI.
+`JajceWorld` should contain geography and world-object presentations. The former
+legacy interaction locations now live as typed storage and activity sites under
+`WorldObjects`; `JajceWorld` should not own `SimulationManager`, simulated NPC
+data, player state, or UI.
 
 Create a small look-development wrapper that instances the same world:
 
@@ -295,7 +293,7 @@ Create `world/jajce/JajceWorld.tscn` with:
 - placeholder `VillageRoot`;
 - placeholder `FoliageRoot`;
 - a navigation region;
-- resource-node containers plus temporary activity markers;
+- resource-node, storage-site, and activity-site containers;
 - lighting and environment.
 
 Create `JajceLookdev.tscn` that instances `JajceWorld` and adds a temporary
@@ -422,8 +420,8 @@ Once the world composition is stable:
 2. Disable or remove the old flat world only after the new instance is present.
 3. Place or move bushes and trees under
    `JajceWorld/WorldObjects/ResourceNodes` while preserving stable IDs.
-4. Reconnect only remaining non-resource activity markers under
-   `JajceWorld/LegacyActivityMarkers`.
+4. Reconnect remaining non-resource activities as typed sites under
+   `JajceWorld/WorldObjects`.
 5. Bake navigation for the new walkable area.
 6. Test each existing task from multiple spawn positions.
 7. Verify task arrival still transitions from traveling to working.
@@ -436,8 +434,8 @@ Once the world composition is stable:
 Do not move simulation ownership into `JajceWorld` to make wiring convenient.
 
 **Status: runtime integration complete.** `main.tscn` now instances the reusable
-world and points player/simulation adapters at its stable-ID resources and
-remaining activity markers. The duplicate flat world objects were removed.
+world and points player/simulation adapters at its stable-ID resources, storage
+site, and activity sites. The duplicate flat world objects were removed.
 The runtime regression checks Terrain3D presence, 24 navigation routes, core
 task execution, starvation/death, player extraction parity, reservations, and
 NPC visual lifecycle. Terrain sculpting and presentation polish remain
@@ -445,7 +443,7 @@ separate work, not blockers for this wiring milestone.
 
 ### Exit condition
 
-The current three NPCs and player can perform all existing prototype behaviors
+The current six NPCs and player can perform all existing prototype behaviors
 inside the new terrain without regression.
 
 ### Phase 5 — Make the simulation readable on video