chore: pin apple-iphone-os-26-structured-location.ics to LF endings

The new parser test relies on LF-only line endings to reproduce the
folded-line failure mode, but the default *.ics rule normalises to
CRLF on checkout. Override it for this fixture, matching the existing
test-relaxed-parsing.ics exception.

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