Add northern pursuit scenario

docs/DATA_MODEL.md

@@ -28,6 +28,7 @@ data/scenarios/014_cangting_pursuit.json
 data/scenarios/015_ye_campaign.json
 data/scenarios/016_ye_siege.json
 data/scenarios/017_ye_surrender.json
+data/scenarios/018_northern_pursuit.json
 ```
 
 ## Campaign
@@ -57,7 +58,8 @@ The campaign file defines scenario order, resource paths, and officers who are a
     { "id": "014_cangting_pursuit", "title": "Cangting Pursuit", "path": "res://data/scenarios/014_cangting_pursuit.json" },
     { "id": "015_ye_campaign", "title": "Ye Campaign", "path": "res://data/scenarios/015_ye_campaign.json" },
     { "id": "016_ye_siege", "title": "Ye Siege", "path": "res://data/scenarios/016_ye_siege.json" },
-    { "id": "017_ye_surrender", "title": "Ye Surrender", "path": "res://data/scenarios/017_ye_surrender.json" }
+    { "id": "017_ye_surrender", "title": "Ye Surrender", "path": "res://data/scenarios/017_ye_surrender.json" },
+    { "id": "018_northern_pursuit", "title": "Northern Pursuit", "path": "res://data/scenarios/018_northern_pursuit.json" }
   ]
 }
 ```

docs/GODOT_4_6_MIGRATION.md

@@ -1,15 +1,16 @@
 # Godot 4.6 Migration
 
-This project targets Godot 4 and is being moved toward Godot 4.6 as the active editor baseline.
+This project targets Godot 4.6 as the active editor baseline.
 
 ## Current Risk Profile
 
 - The project is a simple Godot 4 `Node2D` application with data-driven JSON content.
 - There are no addons, imported art assets, shaders, TileMaps, 3D physics scenes, or export presets yet.
 - The current renderer is explicitly set to `gl_compatibility`, so new-project rendering defaults in Godot 4.6 should not silently change the existing project renderer.
-- `project.godot` still advertises `config/features=PackedStringArray("4.2")`; let the Godot 4.6 editor update project files instead of editing generated scene/resource formats by hand.
+- `project.godot` advertises `config/features=PackedStringArray("4.6")`.
+- Godot 4.6 script UID sidecar files (`*.gd.uid`) are part of the migrated project metadata and should stay versioned.
 
-## Before Opening In 4.6
+## Before Opening In 4.6 From An Older Checkout
 
 1. Create a backup or initialize version control before the editor writes migration changes.
 2. Run the data/readiness check:
@@ -24,7 +25,7 @@ powershell -NoProfile -ExecutionPolicy Bypass -File tools\check_godot46_readines
 $env:GODOT_BIN = "C:\Path\To\Godot_v4.6-stable_win64.exe"
 ```
 
-## Editor Migration Steps
+## Editor Migration Steps From An Older Checkout
 
 1. Open the project folder in Godot 4.6.
 2. Let the editor import the project and accept any project-file migration prompt.

docs/ROADMAP.md

@@ -3,6 +3,7 @@
 ## Milestone 0: Project Foundation
 
 - Godot 4 project opens and runs.
+- Godot 4.6 project metadata exists.
 - Main battle scene loads a JSON battle.
 - Rules and presentation are separated enough to keep iterating.
 
@@ -20,7 +21,7 @@
 - Destination victory conditions and objective map markers exist.
 - Turn-limit conditions and HUD turn-limit display exist.
 - Victory reward summary is visible.
-- Next-battle flow exists across the current seventeen-scenario campaign.
+- Next-battle flow exists across the current eighteen-scenario campaign.
 - Campaign completion and new-campaign reset exist.
 - Reward inventory can be brought into the next battle.
 
@@ -51,7 +52,7 @@
 - Party roster persistence has a first save-file skeleton.
 - Level, experience, and equipment persistence.
 - Chapter selection and save/load.
-- Linear seventeen-scenario campaign order exists.
+- Linear eighteen-scenario campaign order exists.
 - Save reset exists.
 - Victory rewards, consumable counts, equipment stock, and equipped gear persist.
 - A basic pre-battle shop with scenario-specific stock exists. Sell-back and richer item management are still planned.
@@ -76,6 +77,7 @@
 - Fifteenth-scenario content exists with Ye outer defense, Zhang He as a deployable officer, and 014 branch reactions.
 - Sixteenth-scenario content exists with Ye inner siege, Zhang He deployment, and 015 branch reactions.
 - Seventeenth-scenario content exists with Ye surrender, last loyalist resistance, and 016 branch reactions.
+- Eighteenth-scenario content exists with Northern Pursuit, Yuan Shang's rearguard, and 017 branch reactions.
 
 ## Milestone 5: Presentation