feat: bake jajce terrain navigation

docs/BUILD_IN_PUBLIC_PLAN.md

@@ -626,14 +626,14 @@ Completed:
 8. Base Terrain3D collision/navigation guardrails: runtime tests now keep
    Terrain3D collision enabled, keep the old greybox ground out of physics, and
    verify required navigation paths track the authored height field.
+9. Terrain3D-derived playable-loop navigation: `JajceWorld` now uses an
+   external baked navigation resource generated from Terrain3D source geometry,
+   and runtime tests reject partial paths that do not reach their targets.
 
 Next:
 
-1. Continue replacing the temporary greybox navigation source with baked
-   Terrain3D-derived navigation for the sculpted playable loop.
-
-2. Capture and visually review “Jajce Lookdev 01.”
-3. Capture “Simulation Garden 01.”
+1. Capture and visually review “Jajce Lookdev 01.”
+2. Capture “Simulation Garden 01.”
 
 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

docs/LEARNING_ROADMAP.md

@@ -674,6 +674,10 @@ Recently completed:
   now assert Terrain3D collision remains enabled, the hidden greybox ground no
   longer provides physics collision, and tested navigation routes stay close to
   the authored Terrain3D height field.
+- The temporary greybox navigation source was replaced by a project-owned
+  Terrain3D-derived navigation mesh resource generated by
+  `tools/bake_jajce_navigation.gd`; route tests now also reject partial paths
+  that do not reach their requested targets.
 
 This order strengthens the simulation while regularly producing visible
 progress suitable for public development updates.

docs/PROJECT_CONTEXT.md

@@ -193,8 +193,8 @@ study, and patrol target typed activity sites. The migration is documented in
 - **Main scene:** `res://main.tscn`
 - **Terrain:** Terrain3D 1.0.2 is installed and enabled
 - **Jajce runtime:** reusable 512 m Terrain3D seed, greybox landmarks, stable
-  ResourceNode placement, lookdev camera, tested runtime navigation, and base
-  Terrain3D collision/navigation guardrails
+  ResourceNode placement, lookdev camera, and Terrain3D-derived runtime
+  navigation with collision guardrails
 - **Terrain compatibility floor:** Godot 4.4 according to the bundled extension
 - **Version control:** Git
 - **Primary branch:** `main`
@@ -328,10 +328,11 @@ distance with resource `safety_risk`, `comfort_distance`, and
 - warm sky, fog, shadows, and wind-reactive foliage;
 - eight ResourceNodes preserving stable food/wood discovery IDs;
 - typed village pantry storage and typed guard, study, and rest activity sites;
-- a temporary baked navigation loop with 24 tested routes;
+- a Terrain3D-derived baked navigation mesh covering the current playable loop;
 - base collision/navigation guardrails that keep Terrain3D collision enabled,
-  keep the hidden greybox ground out of runtime physics, and compare required
-  navigation paths against the Terrain3D height field;
+  keep the old greybox ground out of runtime physics, require paths to reach
+  their targets, and compare required navigation paths against the Terrain3D
+  height field;
 - a look-development scene and camera.
 
 This is a runtime integration proof, not the final terrain composition.
@@ -538,9 +539,10 @@ 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.
-- The old greybox navigation source remains temporary; current tests now guard
-  against collision/nav regressions, but the next terrain base phase is a
-  Terrain3D-derived bake for the sculpted playable loop.
+- The old greybox navigation source has been replaced by a project-owned
+  Terrain3D-derived navigation resource. The current bake is still a first
+  playable-loop pass, so future terrain sculpting should rerun the bake tool and
+  recheck reachability rather than hand-editing navigation polygons.
 - Terrain3D and the bounded Jajce beauty baseline now run in the main game
   scene; final visual review and character/profession readability remain.
 - Combat, companions, factions, politics, trade, rumours, quests, persistence,