docs: mark jajce runtime integration complete

docs/PROJECT_CONTEXT.md

@@ -192,8 +192,8 @@ migration is documented in
 - **Language:** GDScript (`odig` analysis with warnings treated as errors)
 - **Main scene:** `res://main.tscn`
 - **Terrain:** Terrain3D 1.0.2 is installed and enabled
-- **Jajce scaffold:** separate 512 m Terrain3D seed, greybox landmarks, stable
-  ResourceNode placement, lookdev camera, and temporary navigation spike
+- **Jajce runtime:** reusable 512 m Terrain3D seed, greybox landmarks, stable
+  ResourceNode placement, lookdev camera, and tested runtime navigation
 - **Terrain compatibility floor:** Godot 4.4 according to the bundled extension
 - **Version control:** Git
 - **Primary branch:** `main`
@@ -315,8 +315,8 @@ resource source.
 
 ### Jajce scaffold
 
-`world/jajce/JajceWorld.tscn` now provides a reusable environment scaffold
-separate from `main.tscn`:
+`world/jajce/JajceWorld.tscn` provides the reusable environment instanced by
+`main.tscn`:
 
 - a centered 512 m flat Terrain3D seed split across four regions;
 - dedicated terrain data and assets;
@@ -326,10 +326,10 @@ separate from `main.tscn`:
 - a temporary baked navigation loop with 24 tested routes;
 - a look-development scene and camera.
 
-This is a placement and integration proof, not the final terrain composition.
-`main.tscn` still runs the flat prototype. Terrain3D startup requires several
-physics frames before reliable NavigationServer path queries; the scaffold test
-captures that synchronization requirement.
+This is a runtime integration proof, not the final terrain composition.
+Terrain3D startup requires several physics frames before reliable
+NavigationServer path queries; the scaffold and runtime tests capture that
+synchronization requirement.
 
 ### Current UI
 
@@ -467,9 +467,9 @@ NpcVisual navigates through the active world
 ├── tests/
 │   ├── action_system_boundaries_test.gd
 │   ├── deterministic_simulation_test.gd
-│   ├── flat_map_baseline_test.gd
 │   ├── food_storage_loop_test.gd
 │   ├── jajce_world_scaffold_test.gd
+│   ├── jajce_runtime_integration_test.gd
 │   ├── npc_visual_lifecycle_test.gd
 │   ├── resource_node_player_parity_test.gd
 │   ├── simulation_definitions_test.gd
@@ -526,7 +526,8 @@ These are expected prototype constraints, not necessarily isolated bugs:
   mutation APIs, but selection, execution, target resolution, and active-world
   queries now have focused collaborators.
 - Path failure and interruption emit a `navigation_failed` signal and send the NPC to wander; this is functional but not yet polished.
-- Terrain3D is enabled but not yet used by the main game scene.
+- Terrain3D and the Jajce scaffold now run in the main game scene; terrain
+  sculpting and final presentation are still pending.
 - Combat, companions, factions, politics, trade, rumours, quests, persistence,
   and regional travel do not yet exist.
 - Placeholder geometry is sufficient for debugging but not for build-in-public