java.time Phase 1: LocalDate/LocalTime/LocalDateTime/Instant

Core java.time value types as jolt host objects backed by the inst-time.ss
calendar engine (days-from-civil/civil-from-days/inst-fields/format-ms), in a
new host/chez/java-time.ss. tz-free reps: LocalDate=epoch-day,
LocalTime=nano-of-day, LocalDateTime=(epoch-day,nano-of-day); Instant reuses
the ms-based instant jhost (ms granularity; nano is a documented gap). Each
type registers statics (of/parse/now/MIN/MAX/...), instance methods
(plus/minus/with/get/isBefore/until/toString/...), =/hash, compare,
ISO-8601 print, instance?, and value-host-tags for protocol dispatch.

Reconciles the old ms-based local-date/local-dt stubs into the rich types
(LocalDateTime now prints ISO; .toLocalDate/.atZone paths preserved). The
four cljc.java-time namespaces (local-date/local-time/local-date-time/instant)
load. Deep temporal-field/unit machinery (range/get-long/with-field/until/
adjust-into) stubbed for Phase 2.

12 corpus rows certified vs JVM 1.12.5. make test + shakesmoke green, 0 new
divergences, data.json stays 138/139, selfhost holds.

host/chez/rt.ss

@@ -351,6 +351,12 @@
 ;; jolt-pr-str / jolt-type / instance-check and uses host-static.ss's registries.
 (load "host/chez/inst-time.ss")
 
+;; java.time value types: LocalDate / LocalTime / LocalDateTime / Instant as
+;; tz-free jhost values (epoch-day / nano-of-day / epoch-ms). Loads after
+;; inst-time.ss — it reuses its civil<->days helpers, the jhost registries, and
+;; re-registers a few LocalDateTime/Instant statics to use the richer reps.
+(load "host/chez/java-time.ss")
+
 ;; Chez-side data reader: read-string / __parse-next /
 ;; __read-tagged. Loads after inst-time.ss — __read-tagged reuses its #uuid/#inst
 ;; constructors, and the reader needs the full value/collection layer above.