docs: mark simulation state phase complete

docs/LEARNING_ROADMAP.md

@@ -54,17 +54,21 @@ The gate is complete when the same scenario produces the same checksum without
 loading `main.tscn`, and loading or unloading a visual does not change
 authoritative NPC or resource state.
 
-**Current progress:** the first deterministic slice is implemented:
+**Current progress:** the first two architecture slices are implemented:
 
 - `SimulationClock` advances explicit fixed ticks while preserving remainder;
 - NPC decisions and visual wander requests use controlled per-NPC random
   streams derived from an exported simulation seed;
 - a headless scenario verifies same-seed equality, different-seed divergence,
   and a final-state checksum without loading `main.tscn`.
+- versioned JSON records capture and restore current NPC, village, resource,
+  clock, and RNG state;
+- a save-at-tick-24 continuation test matches an uninterrupted 48-tick
+  checksum and rejects unsupported schema versions.
 
-The gate remains open. Versioned state records, scene-independent resource
-authority, stable definitions, responsibility separation, and visual
-load/unload invariance are still required.
+The gate remains open. Scene-independent resource authority, stable
+definitions, responsibility separation, and visual load/unload invariance are
+still required. See [the simulation state schema](SIMULATION_STATE_SCHEMA.md).
 
 ## Three vertical slices
 
@@ -611,23 +615,23 @@ Completed foundations:
 
 The practical next sequence is:
 
-1. Add versioned serializable NPC, village, and resource state records,
-   including enough clock and RNG state for deterministic continuation.
-2. Move resource amount/reservation authority out of `ResourceNode` scenes.
-3. Replace free-form task and profession strings with stable IDs and
+1. Move resource amount/reservation authority out of `ResourceNode` scenes and
+   make unloaded resources remain in state.
+2. Replace free-form task and profession strings with stable IDs and
    definitions.
-4. Separate action selection, execution, target resolution, and visual travel;
+3. Separate action selection, execution, target resolution, and visual travel;
    remove decision mutation from `WorldViewManager`.
-5. Define active-position synchronization and prove visual unload/reload.
-6. Pass the architecture gate's deterministic headless and unloaded-visual exit
+4. Define active-position synchronization and prove visual unload/reload.
+5. Pass the architecture gate's deterministic headless and unloaded-visual exit
    tests.
-7. Build location-based food storage, inventory, and transactions.
-8. Emit structured economic events while making one NPC visibly gather, carry,
+6. Build location-based food storage, inventory, and transactions.
+7. Emit structured economic events while making one NPC visibly gather, carry,
    store, retrieve, and eat food.
-9. Add versioned save/load before schedules or social state expand.
-10. Resume Terrain3D sculpting, runtime integration, and the simulation-garden
+8. Add save-slot persistence and explicit schema migrations before schedules
+   or social state expand.
+9. Resume Terrain3D sculpting, runtime integration, and the simulation-garden
    beauty pass.
-11. Add stylized character and profession readability plus the reason
+10. Add stylized character and profession readability plus the reason
    inspector.
 
 This order strengthens the simulation while regularly producing visible