docs: mark Jajce scaffold proof complete

docs/PROJECT_CONTEXT.md

@@ -2,7 +2,7 @@
 
 > Agent-facing context for understanding the project quickly.
 >
-> Snapshot basis: repository state after commit `0900022`, July 2026. Treat the
+> Snapshot basis: repository state after commit `556d0fd`, July 2026. Treat the
 > code as the source of truth when this document and the implementation differ.
 
 See the [documentation map](README.md) for the authority and scope of each plan.
@@ -191,6 +191,8 @@ non-resource tasks. The 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
 - **Terrain compatibility floor:** Godot 4.4 according to the bundled extension
 - **Version control:** Git
 - **Primary branch:** `main`
@@ -313,6 +315,24 @@ Storage, rest, study, and guard behavior should later migrate to target types
 that match their actual semantics rather than treating every usable object as a
 resource source.
 
+### Jajce scaffold
+
+`world/jajce/JajceWorld.tscn` now provides a reusable environment scaffold
+separate from `main.tscn`:
+
+- a centered 512 m flat Terrain3D seed split across four regions;
+- dedicated terrain data and assets;
+- greybox ridge, fortress, terraces, houses, mill, bridge, river, and waterfall;
+- four ResourceNodes preserving the flat-map stable IDs;
+- remaining food, guard, study, and rest activity markers;
+- 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.
+
 ### Current UI
 
 A small village panel displays:
@@ -447,8 +467,18 @@ NpcVisual navigates through the active world
 │   ├── SimVillage.gd
 │   └── SimulationManager.gd
 ├── tests/
+│   ├── flat_map_baseline_test.gd
+│   ├── jajce_world_scaffold_test.gd
 │   └── resource_node_player_parity_test.gd
+├── terrain/jajce/             Dedicated Terrain3D seed data and assets
+├── tools/
+│   └── generate_jajce_terrain_seed.gd
 ├── world/
+│   ├── jajce/
+│   │   ├── JajceWorld.tscn
+│   │   ├── JajceLookdev.tscn
+│   │   ├── jajce_world.gd
+│   │   └── beauty_camera.gd
 │   ├── resource_nodes/
 │   │   ├── ResourceNode.gd
 │   │   ├── ResourceNode.gd.uid
@@ -676,13 +706,11 @@ visual milestone should support or reveal actual simulation state.
 
 ## Immediate milestone: scaffold, architecture gate, then simulation garden
 
-Food and wood migration on the flat test map is complete. The next visual step
-is a deliberately minimal `JajceWorld` scaffold, greybox, navigation spike, and
-resource-placement proof. Do not proceed directly from that proof into
-open-ended beauty production.
+Food and wood migration and the deliberately minimal `JajceWorld` scaffold,
+greybox, navigation spike, and stable-ID placement proof are complete. Do not
+proceed directly from that proof into open-ended beauty production.
 
-After the scaffold proves terrain and navigation, complete the architecture
-gate:
+The architecture gate is now the active milestone:
 
 - deterministic clock and controlled random source;
 - fixed-seed headless scenarios with final-state checksums;