core: spec 35-var batch A — 1.11 parsers, map/partition variants, with-redefs, ns fns

Fifteen vars from the spec coverage gap (docs/spec/coverage.md):
parse-long/parse-double/parse-boolean (strict validation; scan-number alone
accepts 0x10), newline, current-time-ms (host clock for time), update-keys/
update-vals (PHM base, collisions last-wins), partitionv/partitionv-all/
splitv-at (lazy seqs of vectors; splitv-at's tail stays a seq, matching the
reference), with-redefs/with-redefs-fn (roots restored on throw), time,
macroexpand (expand-1 to fixpoint), alias/ns-unalias (write BOTH alias stores
— require :as uses string-keyed :imports while ns-aliases reads :aliases;
split filed), ns-publics (symbol-keyed map; publics == interns, no privacy).

Three pre-existing bugs fixed along the way:
- (partition n step pad coll) misparsed pad as the coll and returned ()
- (require 'bare.symbol) rejected — only vector specs were accepted
- analyze-form leaked the interpreted analyzer's ns on a punt: a throw out of
  the analyzer left current-ns=jolt.analyzer and :compile-ns set, so the
  fallback interpretation resolved user vars against the wrong namespace
  (bit (var user-sym) under compile mode)

And one overlay-authoring landmine documented in-code: a 20-coll fn must not
use 30-macros macros (with-redefs-fn's dotimes compiled as a forward ref that
resolved to the macro fn at runtime) — loop/recur instead.

Gate: conformance 316x3 (+14 rows), suite 4324 pass / 78 clean (was 4081/72;
parse_*/update_* files now contribute), baselines raised, all specs+unit,
fixpoint, self-host, sci, staged. Coverage: missing-portable 35 -> 20.

test/spec/numbers-spec.janet

@@ -134,3 +134,26 @@
   ["rand n in [0,n)"    "true" "(let [r (rand 10)] (and (>= r 0) (< r 10)))"]
   ["rand-nth member"    "true" "(contains? #{:a :b :c} (rand-nth [:a :b :c]))"]
   ["rand-nth single"    ":x"   "(rand-nth [:x])"])
+
+# Clojure 1.11 string->scalar parsers: nil on malformed, throw on non-string.
+(defspec "numbers / parse fns (1.11)"
+  ["parse-long"          "42"     "(parse-long \"42\")"]
+  ["parse-long negative" "-7"     "(parse-long \"-7\")"]
+  ["parse-long plus"     "7"      "(parse-long \"+7\")"]
+  ["parse-long float nil" "nil"   "(parse-long \"1.5\")"]
+  ["parse-long hex nil"  "nil"    "(parse-long \"0x10\")"]
+  ["parse-long empty nil" "nil"   "(parse-long \"\")"]
+  ["parse-long junk nil" "nil"    "(parse-long \"12ab\")"]
+  ["parse-long throws"   :throws  "(parse-long 42)"]
+  ["parse-double"        "1.5"    "(parse-double \"1.5\")"]
+  ["parse-double int"    "4.0"    "(parse-double \"4\")"]
+  ["parse-double sci"    "1500.0" "(parse-double \"1.5e3\")"]
+  ["parse-double neg"    "-0.5"   "(parse-double \"-0.5\")"]
+  ["parse-double junk"   "nil"    "(parse-double \"abc\")"]
+  ["parse-double trail"  "nil"    "(parse-double \"1.5x\")"]
+  ["parse-double throws" :throws  "(parse-double :k)"]
+  ["parse-boolean true"  "true"   "(parse-boolean \"true\")"]
+  ["parse-boolean false" "false"  "(parse-boolean \"false\")"]
+  ["parse-boolean case"  "nil"    "(parse-boolean \"True\")"]
+  ["parse-boolean junk"  "nil"    "(parse-boolean \"yes\")"]
+  ["parse-boolean throws" :throws "(parse-boolean true)"])