Chez parity: realized? on lazy-seq + conj! 1-arity identity

realized? threw 'not supported on' for a jolt-lazyseq record (the overlay
reads :jolt/type); add a jolt-lazyseq? arm to the post-prelude wrapper
reading the record's own realized? flag.

conj! 1-arity (conj! coll) is the transducer-completion arity and returns
coll as-is on the JVM, no transient check — we threw 'not a transient'.

Both gates: zero-janet 2696->2698, prelude 2649->2652, 0 new divergences.

host/chez/post-prelude.ss

@@ -62,9 +62,12 @@
 (let ((overlay-realized? (var-deref "clojure.core" "realized?")))
   (def-var! "clojure.core" "realized?"
     (lambda (x)
-      (if (or (jolt-future? x) (jolt-promise? x) (jolt-delay? x))
-          (jolt-conc-realized? x)
-          (jolt-invoke overlay-realized? x)))))
+      (cond
+        ((or (jolt-future? x) (jolt-promise? x) (jolt-delay? x)) (jolt-conc-realized? x))
+        ;; a lazy-seq carries its own realized? flag (lazy-bridge.ss). The overlay
+        ;; realized? reads :jolt/type and throws on a jolt-lazyseq record.
+        ((jolt-lazyseq? x) (jolt-lazyseq-realized? x))
+        (else (jolt-invoke overlay-realized? x))))))
 ;; clojure.edn/read over a reader: the overlay edn.clj drain-reader uses janet/type;
 ;; the native Chez version (io.ss) drains the jhost reader instead (jolt-uicd/jolt-7t3l).
 (def-var! "clojure.edn" "read"

host/chez/transients.ss

@@ -23,14 +23,18 @@
   (jolt-transient-active-set! t #f)
   (jolt-transient-coll t))
 
-;; (conj!) with no args -> a fresh transient vector (Clojure); otherwise mutate t.
+;; (conj!) with no args -> a fresh transient vector (Clojure); (conj! coll) is the
+;; 1-arity transducer-completion arity, which returns coll as-is with NO transient
+;; check (JVM: conj! 1-arity is identity); otherwise mutate t.
 (define (jolt-conj! . args)
-  (if (null? args)
-      (jolt-transient-new (jolt-vector))
+  (cond
+    ((null? args) (jolt-transient-new (jolt-vector)))
+    ((null? (cdr args)) (car args))
+    (else
       (let ((t (car args)) (xs (cdr args)))
         (jolt-trans-check t "conj!")
         (jolt-transient-coll-set! t (apply jolt-conj (jolt-transient-coll t) xs))
-        t)))
+        t))))
 ;; (assoc! t k v & kvs): variadic like Clojure (jolt-assoc already folds pairs).
 (define (jolt-assoc! t . kvs)
   (jolt-trans-check t "assoc!")

test/chez/run-corpus-prelude.janet

@@ -322,8 +322,9 @@
 # jolt-cf1q.7 parity batches (hash/rseq/cat/transient-as-fn + ns runtime fns +
 # runtime-require alias registration) -> 2590; arrays + reader-features/
 # macroexpand/reader-conditional/re-matcher -> 2629; delay/force/realized? -> 2641.
-# Strided runs scale down.
-(def base-floor (scan-number (or (os/getenv "JOLT_CHEZ_PRELUDE_FLOOR") "2648")))
+# STM stub + portable line-seq -> 2649; realized? on a lazy-seq + conj! 1-arity
+# (transducer-completion identity) -> 2652. Strided runs scale down.
+(def base-floor (scan-number (or (os/getenv "JOLT_CHEZ_PRELUDE_FLOOR") "2652")))
 (def floor (if (os/getenv "JOLT_CORPUS_LIMIT") 0 base-floor))
 (when (or (> (length diverged) 0) (< pass floor))
   (printf "REGRESSION: pass %d < floor %d or %d new divergence(s)" pass floor (length diverged)))

test/chez/run-corpus-zero-janet.janet

@@ -200,6 +200,10 @@
     (each k (sort-by (fn [k] (- (get tbl k))) (keys tbl))
       (printf "  %4d x  %s" (get tbl k) k))))
 (report "crash reasons" crash-keys)
+(when (os/getenv "JOLT_DUMP_CRASH_LABELS")
+  (printf "\nCRASH LABELS:")
+  (each [l k] (sort-by (fn [pair] (get pair 1)) crashes)
+    (printf "  [%s] :: %s" k l)))
 (when (> (length diverged) 0)
   (printf "\nNEW divergences (ran, wrong value) — gate FAILS:")
   (each [l m] (slice diverged 0 (min 40 (length diverged)))
@@ -218,8 +222,9 @@
 # ACTUAL (matching certify.clj's eval-isolated) -> 2673; delay/force/realized? ->
 # 2685; deftype (P. args) constructor via host-new var fallback -> 2688;
 # date/time (Date/Timestamp/SimpleDateFormat/TimeZone) + clojure.edn/read over a
-# reader -> 2692.
-(def base-floor (scan-number (or (os/getenv "JOLT_CHEZ_ZJ_FLOOR") "2696")))
+# reader -> 2692; STM stub + portable line-seq -> 2696; realized? on a lazy-seq +
+# conj! 1-arity (transducer-completion identity) -> 2698.
+(def base-floor (scan-number (or (os/getenv "JOLT_CHEZ_ZJ_FLOOR") "2698")))
 (def floor (if (os/getenv "JOLT_CORPUS_LIMIT") 0 base-floor))
 (when (or (> (length diverged) 0) (< pass floor))
   (printf "REGRESSION: pass %d < floor %d or %d new divergence(s)" pass floor (length diverged)))