Define practical experience growth

Docs/KnowledgeAndSkillFoundation.md

@@ -168,3 +168,43 @@ More reliable outcomes:
 Action-effect rule: knowledge should usually adjust probabilities, quality,
 warnings, and explanation. It should only hard-block actions when the action
 would be nonsensical without a discovered concept or required tool.
+
+## Practical Experience Growth
+
+Practical experience should grow from meaningful work, not from standing still
+or repeating a zero-risk input forever. It is the record of a character learning
+how a task feels in the world.
+
+Use:
+
+- Experience increases when a character performs a real survival action with
+  cost, time, context, and outcome.
+- Good candidates include gathering, tool use, crafting, fire maintenance,
+  shelter placement, navigation decisions, first aid, food preparation, and
+  weather-response choices.
+
+Repetition:
+
+- Repetition improves consistency, but repeated identical low-stakes actions
+  should give diminishing returns.
+- Variation should matter: different weather, darkness, tools, materials,
+  terrain, injury state, and resource types teach more than the same easy action.
+
+Mistakes:
+
+- Mistakes can teach when they have a readable cause and the player receives
+  feedback.
+- Failed crafts, wasted resources, unsafe fire placement, bad shelter sites,
+  injury, sickness, and exposure should create learning opportunities if the
+  player can understand what happened.
+
+Recovery from failure:
+
+- Recovering from a bad outcome should teach more than simply failing.
+- Examples include extinguishing a risky fire, treating bleeding, finding safer
+  water, rebuilding a weak shelter, resting after exhaustion, and changing route
+  after getting lost.
+
+Experience gain rule: award experience for meaningful action plus context, apply
+diminishing returns to rote repetition, and give recovery credit when a player
+responds well to a mistake.