slides: add 'lottery in numbers' slide between the diagnosis and the proposal

Concrete examples make the lottery framing land harder than the
mode-comparison table alone:

  - ClickBench Q23 (URL LIKE '%google%'): main 3 612 ms → main+pd 121 ms — 30× speedup
  - ClickBench Q11 (filter col overlaps projection): essentially a tie
  - ClickBench Q21 (mandatory unselective filter): main 859 ms → main+pd 1 669 ms — 1.9× slowdown
  - TPC-DS Q64 (chained hash-join dynamic filters): main 471 ms → main+pd 20 010 ms — 42× slowdown

Same workload (ClickBench has both Q23 and Q21), opposite outcomes — the
point being that the user can't reason about the filter / projection /
plan-shape interaction per query.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: adriangb