docs(greedy): add Walk and Carry and Sort and Pick sections to Greedy Skeleton

apps/docs/content/(05-decision-space)/greedy/index.mdx

@@ -54,6 +54,30 @@ hidden: true
 
 ## The Greedy Skeleton
 
+### Type 1: Walk and Carry
+
+:::info
+No sort. Walk the list once. Carry one number. At each step, decide: keep it, or drop it.
+:::
+
+```python
+def walk_and_carry(nums):
+    carry = start_value
+    best = start_value
+    for n in nums:
+        if carry_is_useless(carry):
+            carry = fresh_start
+        carry = update(carry, n)
+        best = max(best, carry)
+    return best
+```
+
+### Type 2: Sort and Pick
+
+:::info
+Used when order doesn't matter, so you pick the order. Meeting rooms, intervals, "most tasks by a deadline."
+:::
+
 ```python
 def greedy(items):
     # 1. Sort by the greedy key (deadline, end time, size, ratio, ...)