Add :repl/quit and :exit gestures to the REPL

^D (EOF) exits cleanly in canonical mode but some terminals and editors
don't deliver it, leaving the user stuck. Accepting :repl/quit or :exit
as the first form of a line gives a reliable keyword exit that works
everywhere. The check parses the line with read-string rather than
checking the evaluated value, so a nested value that happens to print
as the keyword can't trigger an exit.

host/chez/smoke.sh

@@ -67,5 +67,26 @@ else
   fails=$((fails + 1))
 fi
 
+# REPL must exit on :repl/quit / :exit — a reliable exit that works in any
+# terminal, unlike ^D (which some terminals/editors don't deliver as EOF).
+# Pipe: an evaluable form, the quit keyword, then a sentinel that must NOT run.
+repl_out="$(printf '(+ 1000 23)\n:repl/quit\n(* 999 9)\n' | bin/joltc repl 2>/dev/null)"
+if printf '%s' "$repl_out" | grep -q '1023' && ! printf '%s' "$repl_out" | grep -q '8991'; then
+  pass=$((pass + 1))
+else
+  echo "  FAIL: repl should exit on :repl/quit before later forms"
+  printf '%s\n' "$repl_out" | sed 's/^/    | /'
+  fails=$((fails + 1))
+fi
+
+repl_out="$(printf '(- 2024 1)\n:exit\n(* 999 9)\n' | bin/joltc repl 2>/dev/null)"
+if printf '%s' "$repl_out" | grep -q '2023' && ! printf '%s' "$repl_out" | grep -q '8991'; then
+  pass=$((pass + 1))
+else
+  echo "  FAIL: repl should exit on :exit before later forms"
+  printf '%s\n' "$repl_out" | sed 's/^/    | /'
+  fails=$((fails + 1))
+fi
+
 echo "cli smoke: $pass passed, $fails failed"
 [ "$fails" -eq 0 ]

jolt-core/jolt/main.clj

@@ -93,17 +93,22 @@
   ;; loaded — same context a run gets, so (require '[some.lib]) works in the REPL.
   (try (apply-project! (deps/resolve-project (project-dir)))
        (catch :default _ nil))
-  (println ";; jolt repl — ^D to exit")
+  (println ";; jolt repl — :repl/quit or ^D to exit")
   (loop []
     (print "user=> ") (flush)
     (let [line (read-line)]
       (when line
+        ;; :repl/quit / :exit exit the loop — a reliable gesture that works in any
+        ;; terminal, unlike ^D (some terminals/editors don't deliver it as EOF).
+        (if (#{:repl/quit :exit} (try (read-string line) (catch :default _ nil)))
+          nil
+          (do
             (try (println (pr-str (load-string line)))
                  (catch :default e
                    (println "error:" (or (ex-message e)
                                          (try ((resolve 'jolt.host/condition-message) e) (catch :default _ nil))
                                          (pr-str e)))))
-        (recur)))))
+            (recur)))))))
 
 ;; A deps.edn :tasks entry: a string is a shell command; a map is {:main-opts …}.
 (defn- run-task [name more]