feat: run the real clojure.tools.logging (defmacro/syntax-quote/ns + host shims)

Pivot from a jolt reimplementation to running the upstream library verbatim.
Vendors the real clojure/tools/logging.clj; jolt provides the backend and the
host primitives it needs. Language features (broadly useful for real Clojure
libs), all covered in 3-mode conformance + spec suites:

- defmacro: multi-arity dispatch (jolt-q8l) and a docstring + attr-map + params
  head (jolt-qnr) — the 4-arity log macro and every level macro need these.
- syntax-quote resolves an alias-qualified symbol to its target ns (jolt-9av),
  so a macro template (impl/get-logger) resolves at the use site.
- the ns macro unwraps ^{:map} metadata on the ns name (jolt-8w2 workaround,
  matching def/defn/defmacro).
- a namespace object self-evaluates, so ~*ns* can be spliced into a template.

Host shims (ported from / modeled on clojure where applicable):
- clojure.string/trim-newline (ported, CharSequence interop -> count/subs)
- agent/send-off/send (minimal synchronous stubs; jolt has no thread pool/STM)
- clojure.lang.LockingTransaction/isRunning -> false
- a minimal clojure.pprint (pprint/with-pprint-dispatch/code-dispatch, for spy)
- clojure.tools.logging.impl: a jolt stderr LoggerFactory backend (the library's
  designed pluggable extension point)

docs/libraries.md lists tools.logging; grammar.ebnf metadata note clarified.
Conformance 355/355 x3 modes; full jpm test gate green.

test/spec/strings-spec.janet

@@ -62,3 +62,11 @@
   ["get out of range nil"  "nil"   "(get \"abc\" 9)"]
   ["get negative nil"      "nil"   "(get \"abc\" -1)"]
   ["get default honored"   ":none" "(get \"abc\" 9 :none)"])
+
+# clojure.string/trim-newline (ported from clojure.string): strips trailing \n/\r.
+(defspec "clojure.string / trim-newline"
+  ["trailing newline"   "\"x\""  "(do (require (quote [clojure.string :as s])) (s/trim-newline \"x\\n\"))"]
+  ["trailing \\r\\n"      "\"x\""  "(do (require (quote [clojure.string :as s])) (s/trim-newline \"x\\r\\n\"))"]
+  ["no trailing"        "\"ab\"" "(do (require (quote [clojure.string :as s])) (s/trim-newline \"ab\"))"]
+  ["only newlines"      "\"\""   "(do (require (quote [clojure.string :as s])) (s/trim-newline \"\\n\\n\"))"]
+  ["interior kept"      "\"a\\nb\"" "(do (require (quote [clojure.string :as s])) (s/trim-newline \"a\\nb\\n\"))"])