apl: apl-run-file path → array (+4 tests)

Trivial wrapper: apl-run-file = apl-run ∘ file-read, where
file-read is built-in to OCaml SX.

Tests verify primes.apl, life.apl, quicksort.apl all parse
end-to-end (their last form is a :dfn AST).  Source-then-call
test confirms the loaded file's defined fn is callable, even
when the algorithm itself can't fully execute (primes' inline
⍵ rebinding still missing — :glyph-token, not :name-token).

lib/apl/transpile.sx

@@ -551,3 +551,5 @@
         (else (error "apl-resolve-dyadic: unknown fn-node tag"))))))
 
 (define apl-run (fn (src) (apl-eval-ast (parse-apl src) {})))
+
+(define apl-run-file (fn (path) (apl-run (file-read path))))