mem: typed allocation helpers + drop bare malloc/free (Phase 2.2); resolve 0119 as |>-contract clarification

examples/expected/0838-memory-helpers.stdout

@@ -0,0 +1,8 @@
+create: 7 42
+pipe-create: 1
+alloc: 10 40 len=4
+clone: 10 (orig 99)
+resize: 20 60 len=6
+shrink: 99 20 len=2
+realloc: 1234
+TrackingAllocator: allocs=8 deallocs=8 outstanding=0 total_alloc_bytes=184