The pure-Kotlin half of the world clock, with no Android on it anywhere and no
ambient zone read — the device's zone arrives as an argument, and an
architecture rule now enforces that.
`ZoneCatalog` de-duplicates the device's own tzdata by canonical id and keeps
the region ids, with `UTC` as the one stated exception — and keeps an alias
whose canonical id the device does not have, because tzdata and CLDR ship as
separate modules and can disagree. `ZoneSearch` matches word prefixes over
diacritic-folded text, so "sao" finds São Paulo and "erl" does not find Berlin.
`ZoneComparison` reads the offset and the day difference **at the instant**, so
Berlin to Sydney is ten hours in January and eight in July. `AnalogFace` turns
an instant into hand angles and says whether it is day or night there.
`Zones.isValid` now tests a snapshot rather than allocating the platform's set
on every call; tzdata takes effect at reboot, so the answer cannot change under
a running process.
makiolaj
e0d5f1f254