chore(fixtures): delete stale SafeDOMExample.res ReScript fixture (Refs gitbot-fleet#148, #208; affinescript#229)

Removes 189 copies of the stale `SafeDOMExample.res` ReScript fixture from this repo. One of 1,267 byte-clustered copies across the estate (129 repos). ReScript is fully banned in new code (2026-04-30 policy refresh). Current-grammar AffineScript replacement lives at gitbot-fleet/bots/*/examples/SafeDOMExample.affine (PR gitbot-fleet#210 MERGED). The example fixtures are not load-bearing — propagated from an earlier template-instantiation script.

Refs hyperpolymath/gitbot-fleet#148, #208
Refs hyperpolymath/affinescript#57, #229

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

Author: hyperpolymath