Chez Phase 1 (increment 3r): dynamic-var constants

host/chez/dynamic-vars.ss binds the two seed-native dynamic vars that aren't
emitted into the prelude: *clojure-version* (the {:major 1 :minor 11 ...} map) and
*unchecked-math* (false). Removes their two run-corpus-prelude allowlist entries
(now 11, all passing).

*ns* is deferred to jolt-b4kl: it needs a namespace value that is not a map yet
answers (get ns :name) for the overlay ns-name, plus str/find-ns support.

Parity 1530 -> 1532/2497, 0 new divergences. emit-test 305/305.

test/chez/README.md

@@ -185,6 +185,11 @@ class names, eval-order, with-open — all deferred Phase-2 / dynamic-var gaps).
     procedure. Transparent for procedures; the hot self-recursive call is a `:local`
     known-proc, so it stays direct. (Class-based dispatch — `(class x)`/`String` — is
     deferred; it needs the deftype/class subsystem.)
+- inc 3r dynamic-var constants (jolt-9ls5): `host/chez/dynamic-vars.ss` binds the seed
+  natives `*clojure-version*` (the `{:major 1 :minor 11 …}` map) and `*unchecked-math*`
+  (false), removing their two parity allowlist entries. `*ns*` is deferred (jolt-b4kl):
+  it needs a namespace value that is not a map (`map?` false) yet answers
+  `(get ns :name)` for the overlay `ns-name`, plus `str`/`find-ns` support.
 
 The remaining buckets are the punch-list the next increments chase: ~361 emit-fail
 (genuine host interop — qualified Java/Janet refs, runtime `defmacro`/`eval`, out of

test/chez/emit-test.janet

@@ -609,6 +609,18 @@
   (let [[code out err] (run-jolt-chez "(do (defmulti f identity) (defmethod f 1 [_] \"one\") (f 99))")]
     (ok "multimethod: no match throws" (not= code 0) (string "code=" code))))
 
+# 3w) dynamic-var constants (jolt-9ls5): *clojure-version* (a map) and
+#   *unchecked-math* (false) are seed natives, def-var!'d by host/chez/dynamic-vars.ss.
+#   (*ns* needs a namespace value with get-see-through and map?=false — deferred.)
+# (map? *clojure-version*) is intentionally NOT asserted: the seed stores it as a
+# mutable table, so its map? is false (a seed quirk); Chez models it as a real map
+# (map? true). Not a corpus contract, so the divergence is moot.
+(each src ["(= 1 (:major *clojure-version*))" "(= 11 (:minor *clojure-version*))"
+           "(= false *unchecked-math*)"]
+  (let [[code out err] (run-prelude src) want (cli-oracle src)]
+    (ok (string "dynvar: " src) (and (= code 0) (= out want))
+        (string "chez=" out " janet=" want " | " err))))
+
 # 4) perf signal: emitted fib(30) in-Scheme timing (excludes Chez startup), to
 #    track against the spike ceiling (hand-Scheme fib ~5ms). Informational — the
 #    jolt-truthy? wrapper (~3x) and flonum modeling are known Phase-4 levers.

test/chez/run-corpus-prelude.janet

@@ -53,8 +53,7 @@
    "str of *ns*" true
    "*ns* user" true
    "str of a var" true
-   "*clojure-version* major" true
-   "*unchecked-math*" true
+   # *clojure-version* / *unchecked-math* now bound by dynamic-vars.ss (inc 3r)
    # (str [##Inf]) wants "[Infinity]" but the Chez -e printer (jolt-pr-str, which
    # str falls back to for collections) renders inf as "inf" — str needs a
    # recursive long-form renderer, the Phase-2 canonical printer. Top-level
@@ -137,8 +136,9 @@
 # Full-corpus baseline: inc 3j 1220/2497; 3k (converters) 1326; 3l (transients)
 # 1382; 3m (numeric-edge emit + variadic assoc!) 1407; 3n (seq-native shims +
 # reduced) 1467; 3o (transducer arities) 1493; 3p (misc seq/regex gaps) 1506;
-# 3q (multimethod dispatch + late-bind) 1530. Strided runs scale down.
-(def base-floor (scan-number (or (os/getenv "JOLT_CHEZ_PRELUDE_FLOOR") "1530")))
+# 3q (multimethod dispatch + late-bind) 1530; 3r (dynamic-var constants) 1532.
+# Strided runs scale down.
+(def base-floor (scan-number (or (os/getenv "JOLT_CHEZ_PRELUDE_FLOOR") "1532")))
 (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)))