Phases 15-16: SCI bootstrap, Janet interop, eval, lazy-cat, CLJS ported tests

- SCI bootstrap complete: all 9 SCI source files load (317 forms, 0 failures)
- prefer-method/remove-method/remove-all-methods promoted to special forms
- eval special form (interpreter + compiler) with eval-test.janet
- lazy-cat macro with structural equality tests in lazy-test.janet
- Janet-native interop via . special form on tables/structs:
  field access (. obj :key), method calls (. obj method args...)
  fn* form compilation support, .- reader sugar
  interop-test.janet with 7 test sections (14 assertions)
- New core bindings: with-meta, var-dynamic?, load-string
- ^:dynamic def handler, core-str nil handling, core-meta for with-meta
- 7 new CLJS ported test files: cljs-port-6 through -10, cljs-core-test, cljs-collections-test
- test-sci-runtime.janet verifies SCI namespaces/types/Var/IBox/IVar
- 317/317 tests pass, 0 failing scripts, 440+ assertions across 31 test files
- README updated with Janet interop documentation

test/cljs-port-7.janet

@@ -0,0 +1,20 @@
+(use ../src/jolt/api)
+(defn ct-eval [ctx s] (eval-string ctx s))
+(print "=== CLJS Ported Part 7 ===")
+
+(print "32: seq destructuring...")
+(let [ctx (init)]
+  (assert (= 1 (ct-eval ctx "(let [[x] [1 2 3]] x)")) "seq destructure")
+  (assert (= 2 (ct-eval ctx "(let [[_ y] [1 2 3]] y)")) "seq destructure skip")
+  (assert (= 3 (ct-eval ctx "(let [[_ _ z] [1 2 3]] z)")) "seq destructure end"))
+(print "  ok")
+
+(print "33: & rest args...")
+(let [ctx (init)]
+  (ct-eval ctx "(defn sum [& xs] (apply + xs))")
+  (assert (= 6 (ct-eval ctx "(sum 1 2 3)")) "& rest sum")
+  (ct-eval ctx "(defn first-two [a b & rest] (count rest))")
+  (assert (= 2 (ct-eval ctx "(first-two 1 2 3 4)")) "& rest after fixed"))
+(print "  ok")
+
+(print "\nAll CLJS Ported Part 7 tests passed!\n")