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/records.ss

@@ -141,6 +141,9 @@
         ((jinst? obj) '("Date" "java.util.Date" "Timestamp" "java.sql.Timestamp" "Object"))
         ((jbigdec? obj) '("BigDecimal" "java.math.BigDecimal" "Number" "Object"))
         ((and (jhost? obj) (string=? (jhost-tag obj) "instant")) '("Instant" "java.time.Instant" "Object"))
+        ((and (jhost? obj) (string=? (jhost-tag obj) "local-date")) '("LocalDate" "java.time.LocalDate" "Object"))
+        ((and (jhost? obj) (string=? (jhost-tag obj) "local-time")) '("LocalTime" "java.time.LocalTime" "Object"))
+        ((and (jhost? obj) (string=? (jhost-tag obj) "local-date-time")) '("LocalDateTime" "java.time.LocalDateTime" "Object"))
         ;; java.sql.Date — a distinct class from java.util.Date so a protocol
         ;; extended to both (data.json's JSONWriter) routes a sql.Date to its impl.
         ((and (jhost? obj) (string=? (jhost-tag obj) "sql-date")) '("java.sql.Date" "Date" "java.util.Date" "Object"))