chore(fixtures): delete stale SafeDOMExample.res ReScript fixture (Refs gitbot-fleet#148, #208) (#21)

Delete 1 stale `SafeDOMExample.res` copies — over-propagated ReScript
fixture. ReScript fully banned (2026-04-30 policy). Current-grammar
AffineScript replacement at gitbot-fleet#210 MERGED. Not load-bearing
for this repo. Refs hyperpolymath/gitbot-fleet#148, #208 ;
affinescript#57, #229. 🤖 Generated with Claude Code

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

Author: hyperpolymath