test: port clojure-test-suite as baseline-guarded integration battery

Run the external cross-dialect clojure-test-suite (lread/clojure-test-suite,
240 per-fn .cljc files in clojure.test format) against Jolt:

- test/support/clojure_test.clj: minimal clojure.test + portability shims
  (deftest/is/testing/are + when-var-exists/thrown?/big-int?/lazy-seq?) — just
  enough surface to load the suite and tally pass/fail/error. Pre-loaded so the
  suite's (require [clojure.test ...]) finds it already populated.
- test/integration/suite-worker.janet: one-shot worker that loads the shim,
  the suite's number-range helper ns, and a single .cljc file, then prints
  'pass fail error'.
- test/integration/clojure-test-suite-test.janet: spawns a worker per file
  under an ev/with-deadline wall-clock budget (so infinite-seq tests that hang
  Jolt's eager evaluator are auto-contained, not a manual skip-list) and asserts
  pass/clean-file counts stay at/above a baseline. References ~/src/clojure-test-suite
  if present; skips cleanly when absent, like the jank battery.

Current: 210 files run, 7 timed out, 2233 assertions -> 1683 pass / 350 fail /
200 error, 23 clean files. Remaining fails are genuine divergences (float/ratio/
bigint, lenient transients where Clojure throws), tracked separately.

Fixes two real evaluator bugs the suite surfaced:
- :refer now preserves a referred macro's :macro flag (was interned as a plain
  value, degrading referred macros to functions).
- resolve-var now resolves ns aliases (like resolve-sym), so aliased macros
  (e.g. p/thrown? via :as p) dispatch as macros instead of being called as fns.

README.md

@@ -99,8 +99,11 @@ Tests are organized in three layers:
   per public API area) that collectively pin down Jolt's defined behavior. This
   is the authoritative description of what Jolt promises.
 - **`test/integration/`** — cross-cutting and regression batteries: the Clojure
-  conformance suite, SCI bootstrap/runtime loading, jank conformance, compile-mode
-  tests, the library API, and a broad systematic-coverage net.
+  conformance suite, SCI bootstrap/runtime loading, jank conformance, the
+  cross-dialect [clojure-test-suite](https://github.com/lread/clojure-test-suite)
+  (run via a minimal `clojure.test` shim against `~/src/clojure-test-suite`, if
+  present, and baseline-guarded), compile-mode tests, the library API, and a
+  broad systematic-coverage net.
 - **`test/unit/`** — white-box tests for individual components (reader,
   evaluator, types, persistent collections, regex, compiler).