Hyperscript: remove/tell/transition commands, test generator ref() fix

Parser: remove me/[@attr]/{css}, tell body scoping (skip then),
transition from/to syntax + my/style prefixes.
Compiler: remove-element, remove-attr, remove-css, transition-from.
Runtime: hs-transition-from for from/to CSS transitions.
Generator changes (already committed) fix ref() unnamed-first mapping,
assertion dedup for pre/post pairs, on-event then insertion.

Conformance: 374→395 (+21 tests, 48%)

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

lib/hyperscript/parser.sx

@@ -1011,18 +1011,21 @@
         (fn
           ()
           (let
-            ((prop (get (adv!) "value")))
-            (expect-kw! "to")
+            ((prop (cond ((= (tp-type) "style") (get (adv!) "value")) ((= (tp-val) "my") (do (adv!) (if (= (tp-type) "style") (get (adv!) "value") (get (adv!) "value")))) (true (get (adv!) "value")))))
             (let
-              ((value (parse-expr)))
+              ((from-val (if (match-kw "from") (parse-expr) nil)))
+              (expect-kw! "to")
               (let
-                ((dur (if (match-kw "over") (if (= (tp-type) "number") (parse-dur (get (adv!) "value")) 400) nil)))
+                ((value (parse-expr)))
                 (let
-                  ((tgt (parse-tgt-kw "on" (list (quote me)))))
+                  ((dur (if (match-kw "over") (parse-expr) nil)))
                   (if
-                    dur
-                    (list (quote transition) prop value dur tgt)
-                    (list (quote transition) prop value tgt))))))))
+                    from-val
+                    (list (quote transition-from) prop from-val value dur)
+                    (if
+                      dur
+                      (list (quote transition) prop value dur nil)
+                      (list (quote transition) prop value nil)))))))))
       (define
         parse-repeat-cmd
         (fn