docs: mark simulation definitions phase complete

docs/LEARNING_ROADMAP.md

@@ -54,7 +54,7 @@ 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 three architecture slices are implemented:
+**Current progress:** the first four architecture slices are implemented:
 
 - `SimulationClock` advances explicit fixed ticks while preserving remainder;
 - NPC decisions and visual wander requests use controlled per-NPC random
@@ -70,9 +70,14 @@ authoritative NPC or resource state.
   geometry;
 - an unload/rebind regression proves resource state remains authoritative while
   its scene node is absent.
+- stable StringName IDs and validated custom resources define all current
+  actions and professions;
+- NPC duration/preference logic, resource target metadata, generation, and
+  serialized references resolve through the definition registry.
 
-The gate remains open. Stable definitions, responsibility separation, and NPC
-visual load/unload invariance are still required. See
+The gate remains open. Responsibility separation and NPC visual load/unload
+invariance are still required. See
+[the simulation definitions](SIMULATION_DEFINITIONS.md) and
 [the simulation state schema](SIMULATION_STATE_SCHEMA.md).
 
 ## Three vertical slices
@@ -620,21 +625,19 @@ Completed foundations:
 
 The practical next sequence is:
 
-1. Replace free-form task and profession strings with stable IDs and
-   definitions.
-2. Separate action selection, execution, target resolution, and visual travel;
+1. Separate action selection, execution, target resolution, and visual travel;
    remove decision mutation from `WorldViewManager`.
-3. Define active-position synchronization and prove visual unload/reload.
-4. Pass the architecture gate's deterministic headless and unloaded-visual exit
+2. Define active-position synchronization and prove visual unload/reload.
+3. Pass the architecture gate's deterministic headless and unloaded-visual exit
    tests.
-5. Build location-based food storage, inventory, and transactions.
-6. Emit structured economic events while making one NPC visibly gather, carry,
+4. Build location-based food storage, inventory, and transactions.
+5. Emit structured economic events while making one NPC visibly gather, carry,
    store, retrieve, and eat food.
-7. Add save-slot persistence and explicit schema migrations before schedules
+6. Add save-slot persistence and explicit schema migrations before schedules
    or social state expand.
-8. Resume Terrain3D sculpting, runtime integration, and the simulation-garden
+7. Resume Terrain3D sculpting, runtime integration, and the simulation-garden
    beauty pass.
-9. Add stylized character and profession readability plus the reason
+8. Add stylized character and profession readability plus the reason
    inspector.
 
 This order strengthens the simulation while regularly producing visible