HS parser: fix number+comparison keyword collision, eval-hs uses hs-compile

Parser: skip unit suffix when next ident is a comparison keyword
(starts, ends, contains, matches, is, does, in, precedes, follows).
Fixes "123 starts with '12'" returning "123starts" instead of true.

eval-hs: use hs-compile directly instead of hs-to-sx-from-source with
"return " prefix, which was causing the parser to consume the comparison
as a string suffix.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/playwright/generate-sx-tests.py

@@ -878,7 +878,7 @@ output.append(';; Evaluate a hyperscript expression and return its result.')
 output.append(';; Compiles the expression, wraps in a thunk, evaluates, returns result.')
 output.append('(define eval-hs')
 output.append('  (fn (src)')
-output.append('    (let ((sx (hs-to-sx-from-source (str "return " src))))')
+output.append('    (let ((sx (hs-to-sx (hs-compile src))))')
 output.append('      (let ((handler (eval-expr-cek')
 output.append('              (list (quote fn) (list (quote me)) (list (quote let) (list (list (quote it) nil) (list (quote event) nil)) sx)))))')
 output.append('        (handler nil)))))')