Layered Temporal time zone providers

Date: 2026-04-28 Area: runtime Pull Request: #440

Temporal named time zones use layered providers in this order: GOCCIA_TZDIR, Unix TZif files, Windows ICU, then embedded TZif resource fallback. The embedded IANA payload is generated as Generated.TimeZoneData.res with a small linker unit instead of a large Pascal array, keeping portability while leaving lookup and parsing logic in hand-authored units. Temporal Time Zone Data. Generated Timezone Data.