Fold jolt-deps into the jolt binary

Dependency resolution now lives in the `jolt` CLI itself instead of a separate
jolt-deps executable. `jolt` resolves a deps.edn into JOLT_PATH/JOLT_APP_PATHS
in-process and dispatches the deps subcommands:

  jolt -M:alias [args]   run the alias :main-opts
  jolt -A:alias CMD      run CMD with the alias paths
  jolt run FILE          resolve, then run FILE
  jolt path | tasks | task NAME

A deps.edn in the working dir is auto-resolved for the runnable commands
(repl/-m/-e/nrepl-server/FILE), so e.g. `jolt -M:nrepl` (or plain
`jolt nrepl-server`) starts an nREPL with the project and its deps loaded.

The runtime core stays deps-agnostic — it only reads JOLT_PATH. The resolver
(deps.janet) is reached only from the CLI entry and loads jpm lazily, so a run
with no deps.edn never touches it and an app baked from its own jolt/api entry
never links it. resolve-deps-argv only resolves on an explicit deps command or
when a deps.edn is present; help/version never do.

jolt-deps stays as a thin deprecation shim that forwards to `jolt`, so existing
scripts keep working. Docs (README, CLAUDE.md, building-and-deps, tools-deps)
and the help text updated.

test/integration/deps-merged-cli-test.janet

@@ -0,0 +1,98 @@
+# jolt-deps folded into jolt: the single `jolt` binary resolves a deps.edn into
+# JOLT_PATH in-process and dispatches the deps subcommands (path/-M/run/tasks/
+# task), and auto-resolves a deps.edn for runnable commands (repl/-m/-e/FILE).
+# Drives the BUILT binary (baked overlay -> cwd-independent) from a fixture
+# project dir so deps.edn in cwd is picked up. :local/root deps only — no
+# network. Skips cleanly if build/jolt is absent (source-only run).
+
+(def repo-root (os/cwd))
+(def jolt (string repo-root "/build/jolt"))
+
+(if-not (os/stat jolt)
+  (do (print "deps-merged-cli: SKIP (no build/jolt — run from source)") (os/exit 0)))
+
+(def base (string (or (os/getenv "TMPDIR") "/tmp") "/jolt-merged-cli-" (os/time)))
+(defn rmrf [p]
+  (when (os/stat p)
+    (if (= :directory (os/stat p :mode))
+      (do (each e (os/dir p) (rmrf (string p "/" e))) (os/rmdir p))
+      (os/rm p))))
+(rmrf base)
+(defn mkdirs [p]
+  (var acc nil)
+  (each seg (filter |(not= "" $) (string/split "/" p))
+    (set acc (if (nil? acc) (string "/" seg) (string acc "/" seg)))
+    (unless (os/stat acc) (os/mkdir acc))))
+
+# project depends on a local lib; an alias with :main-opts; an :extra-paths
+# alias; a :tasks map (shell task)
+(each d ["proj/src/app" "lib/src/mylib"] (mkdirs (string base "/" d)))
+(spit (string base "/proj/deps.edn")
+      `{:paths ["src"]
+        :deps {my/lib {:local/root "../lib"}}
+        :aliases {:run {:main-opts ["-m" "app.core"]}
+                  :dev {:extra-paths ["dev"]}}
+        :tasks {greet "echo hello-task"}}`)
+(spit (string base "/lib/deps.edn") `{:paths ["src"]}`)
+(spit (string base "/lib/src/mylib/core.clj") "(ns mylib.core)\n(defn answer [] 42)\n")
+(spit (string base "/proj/src/app/core.clj")
+      "(ns app.core (:require [mylib.core :as m]))\n(defn -main [& args] (println \"MAIN\" (m/answer) (count args)))\n")
+(spit (string base "/proj/script.clj")
+      "(require '[mylib.core :as m])\n(println \"SCRIPT\" (m/answer))\n")
+
+# Run the built jolt from a given dir (cwd matters: deps.edn is read from cwd).
+# Direct spawn (no shell) so arbitrary -e exprs need no quoting. Returns out+err.
+(defn- run-in [dir & args]
+  (def prev (os/cwd))
+  (os/cd dir)
+  (def p (os/spawn [jolt ;args] :p {:out :pipe :err :pipe}))
+  (def out (:read (p :out) :all))
+  (def err (:read (p :err) :all))
+  (os/proc-wait p)
+  (os/cd prev)
+  (string (or out "") (or err "")))
+
+(var fails 0)
+(defn check [label got pred]
+  (if (pred got) (print "  ok   " label)
+    (do (++ fails) (printf "  FAIL %s: got %q" label got))))
+(defn- has [sub] (fn [s] (truthy? (string/find sub s))))
+
+(def proj (string base "/proj"))
+
+# `path` prints the resolved roots: project's own src + the local dep's src
+(check "path includes project src"  (run-in proj "path") (has "/proj/src"))
+(check "path includes local dep src" (run-in proj "path") (has "/lib/src"))
+
+# `-M:run` runs the alias :main-opts (-m app.core), requiring the local dep
+(check "-M:run runs -main through resolved deps" (run-in proj "-M:run" "x" "y") (has "MAIN 42 2"))
+
+# `run FILE` resolves deps then runs the file
+(check "run FILE resolves deps" (run-in proj "run" "script.clj") (has "SCRIPT 42"))
+
+# `tasks` lists the :tasks entries; `task NAME` runs a shell task
+(check "tasks lists greet" (run-in proj "tasks") (has "greet"))
+(check "task runs shell command" (run-in proj "task" "greet") (has "hello-task"))
+
+# auto-resolve: a plain -e in a deps.edn dir can require the local dep
+(check "-e auto-resolves deps.edn in cwd"
+       (run-in proj "-e" "(require '[mylib.core :as m]) (println (m/answer))")
+       (has "42"))
+
+# -A:alias forces resolution (with that alias) for a runnable command
+(check "-A:dev with -e resolves + runs"
+       (run-in proj "-A:dev" "-e" "(println (+ 1 2))")
+       (has "3"))
+
+# no deps.edn: plain run is unaffected (resolver/jpm never touched)
+(mkdirs (string base "/plain"))
+(check "-e in a no-deps dir works unchanged"
+       (run-in (string base "/plain") "-e" "(println (* 6 7))")
+       (has "42"))
+# help/version never trigger resolution
+(check "version works in a deps dir" (run-in proj "--version") (has "jolt v"))
+
+(rmrf base)
+(if (> fails 0)
+  (do (printf "deps-merged-cli: %d FAILED" fails) (os/exit 1))
+  (print "deps-merged-cli: all cases passed"))