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The previous commit asserted southern zones round-trip through iCal unchanged but verified it only by reasoning. Close that gap with explicit tests: - A Sydney VTIMEZONE export block: TZID:Australia/Sydney, DAYLIGHT->+1100 (AEDT) / STANDARD->+1000 (AEST), first-Sunday rules (BYMONTH=10/4 BYDAY=1SU), and DAYLIGHT DTSTART:19701004T020000 — confirming the -480 rule time folds the from-offset back to the correct local 02:00 AEST transition. - A southern-zone DTSTART;TZID export -> import round-trip preserving :dtstart. +7 ical tests (now 63). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>