apl: end-to-end pipeline apl-run + 25 source-string tests (400/400)

apl-run = parse-apl + apl-eval-ast against empty env.  Wires
tokenizer + parser + transpile + runtime as one entry point.
test.sh now loads tokenizer.sx + parser.sx alongside transpile.sx.

Source-string tests cover scalars, strands, dyadic arith,
right-to-left precedence, monadic primitives, /, \, ⌈/, ×/,
∘.×, +.×, ⍴, comparisons, classic one-liners.

Tokenizer doesn't yet handle decimal literals (3.7 → 3 . 7),
so two such tests substituted with integer min/max-reduce.

lib/apl/transpile.sx

@@ -440,3 +440,5 @@
                 (g (apl-resolve-dyadic g-node env)))
               (fn (a b) (apl-inner f g a b)))))
         (else (error "apl-resolve-dyadic: unknown fn-node tag"))))))
+
+(define apl-run (fn (src) (apl-eval-ast (parse-apl src) {})))