ocaml: phase 5.1 daily_temperatures.ml baseline (sum of waits = 10)

Monotonic decreasing stack — for each day i, pop entries from
the stack whose temperature is strictly less than today's; their
answer is (i - popped_index).

  temps  = [73; 74; 75; 71; 69; 72; 76; 73]
  answer = [ 1;  1;  4;  2;  1;  1;  0;  0]
  sum    = 10

Complementary to next_greater.ml (iter 256) — same monotonic-stack
skeleton but stores the distance to the next greater element
rather than its value.

Tests `match !stack with | top :: rest when …` pattern with
guard inside a while-cont-flag loop.

198 baseline programs total.

lib/ocaml/baseline/expected.json

@@ -39,6 +39,7 @@
   "count_palindromes.ml": 9,
   "count_subarrays_k.ml": 7,
   "csv.ml": 10,
+  "daily_temperatures.ml": 10,
   "egg_drop.ml": 8,
   "dijkstra.ml": 7,
   "dp_word_break.ml": 4,