Update decision-making phase and enhance localization for presence tracking

- Marked tasks as complete in the decision-making phase documentation, indicating readiness for implementation.
- Updated the README to reflect the completion status of the decision-making phase.
- Enhanced localization strings to include new presence tracking features, improving user experience.
- Revised the game screen logic to display real-time presence status, including walking states for individuals.
- Added tests to validate the new localization strings and presence functionalities, ensuring robust performance.

src/HSchool.Ai/LessonLearning.cs

@@ -0,0 +1,28 @@
+using HSchool.Content;
+
+namespace HSchool.Ai;
+
+/// <summary>
+/// How much a lesson adds to one skill this step. Hungry learns worse; trait offsets scale the
+/// rate. The world stores the running total — this is just the number.
+/// </summary>
+public static class LessonLearning
+{
+    public static float NeedFactor(float hunger) => Math.Clamp(0.25f + (0.75f * hunger), 0.25f, 1f);
+
+    public static float TraitFactor(int offset) => Math.Max(0.1f, 1f + (offset / 100f));
+
+    public static float Gain(
+        float current,
+        SkillDef skill,
+        float share,
+        float lessonSkillPerHour,
+        float hours,
+        float hunger,
+        int traitOffset)
+    {
+        ArgumentNullException.ThrowIfNull(skill);
+        var delta = share * lessonSkillPerHour * hours * NeedFactor(hunger) * TraitFactor(traitOffset);
+        return Math.Clamp(current + delta, skill.Range.Min, skill.Range.Max);
+    }
+}