feat: Add specialized polymorphic handling for egg object

Add humorous specialized handle_take(egg) and handle_drop(egg) functions
with ticking egg messages and special behavior for the jewel-encrusted egg.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: skeptomai

examples/mini_zork.grue

@@ -369,11 +369,35 @@ fn handle_take(obj) {
 fn handle_take(leaflet){
     clear_quit_state();
     player.score = player.score + 2;
+    if leaflet.location == player {
+        println("You already have that.");
+        return;
+    }
 
+    if !player_can_see(leaflet) {
+        println("You can't see any such thing.");
+        return;
+    }
     move(leaflet, player);
     println("Took leaflet.");
 }
 
+fn handle_take(egg){
+    clear_quit_state();
+    if egg.location == player {
+        println("You already have that.");
+        return;
+    }
+
+    if !player_can_see(egg) {
+        println("You can't see any such thing.");
+        return;
+    }
+
+    move(egg, player);
+    println("You are the proud owner of a very special egg.. Is it ticking?");
+}
+
 fn handle_drop(obj) {
     if obj.location != player {
         println("You don't have that.");
@@ -384,6 +408,16 @@ fn handle_drop(obj) {
     println("Dropped.");
 }
 
+fn handle_drop(egg) {
+    if egg.location != player {
+        println("You don't have that.");
+        return;
+    }
+    
+    move(egg, player.location);
+    println("Ok, now I really think it's ticking. Perhaps you should walk away... quickly");    
+}
+
 fn show_inventory() {
     let items = player.contents();
     if items.empty() {