* Update abbreviationForDate and _abbreviationForNameAndDate to read the short time zone name directly from Intl.DateTimeFormat(...).formatToParts(). This replaces regular expression parsing of date strings.
* Update knownTimeZoneNames to use Intl.supportedValuesOf('timeZone') to retrieve the complete IANA time zone set. The method falls back to the legacy 48-city list if Intl is unavailable.
* Replace duplicate regular expression logic in testInitWithNameRespectsDaylightSaving with a direct Intl call.
* Add pinning tests for the recently corrected offsets and the unchanged MSD value.
* Add a feature-detected test for the knownTimeZoneNames upgrade.
* Add two disabled tests to document unresolved gaps: non-English localizedName outputs and ambiguous reverse offset lookups.
* The full IANA-identity redesign as a separate task. Abbreviation-keyed lookups, colliding offsets, and English-only localizedName limitations remain unresolved in this interim fix.
David Richardson
c39f03823a