slides: rebuild pptx after the 2026-04-22 revisions

Hack-A-Thon-Scientist-Assessment.pptx rebuilt via gen_pptx.py so
the packaged deck picks up the slide-2 / 3 / 3d / 4 / 5 / 5a / end
revisions committed in the preceding four commits.

13 slides, 2.9 MB.  Same slide order as the README table.

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